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Debt Instruments - Narrative (Details) (USD $)
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1 Months Ended |
11 Months Ended |
12 Months Ended |
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Sep. 30, 2013
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Jul. 31, 2013
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May 31, 2011
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Dec. 31, 2013
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Dec. 31, 2014
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Jan. 31, 2013
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| Line of credit |
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| Debt Instruments |
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| Maximum borrowings available |
$ 60,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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$ 30,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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| Line of credit facility, unused capacity, commitment fee percentage |
0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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| Interest rate, increase (decrease) |
0.75%us-gaap_DebtInstrumentInterestRateIncreaseDecrease
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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| Minimum liquidity requirement |
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5,000,000.0p_LineOfCreditFacilityFinancialCovenantMinimumLiquidityRequirement
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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| Amount borrowed |
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10,000,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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| Outstanding borrowings |
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0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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| Available borrowing capacity |
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58,900,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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58,900,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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| Debt issuance cost |
500,000us-gaap_DebtIssuanceCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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1,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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| Credit facility term |
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4 years
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| Amortization of debt issuance costs |
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200,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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200,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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300,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
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| Line of credit | Minimum |
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| Debt Instruments |
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| Line of credit facility, unused capacity, commitment fee percentage |
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0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Line of credit | Maximum |
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| Debt Instruments |
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| Line of credit facility, unused capacity, commitment fee percentage |
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0.625%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Line of credit | LIBOR |
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| Debt Instruments |
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| Variable interest rate base |
LIBOR
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LIBOR
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| Line of credit | LIBOR | Minimum |
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| Debt Instruments |
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| Margin (as a percent) |
2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
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2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
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| Line of credit | LIBOR | Maximum |
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| Debt Instruments |
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| Margin (as a percent) |
2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
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3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
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| Line of credit | Alternate base rate |
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| Debt Instruments |
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| Variable interest rate base |
alternate base rate
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alternate base rate
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| Line of credit | Alternate base rate | Minimum |
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| Debt Instruments |
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| Margin (as a percent) |
1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= p_DebtInstrumentVariableRateBaseAlternateBaseRateMember
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1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= p_DebtInstrumentVariableRateBaseAlternateBaseRateMember
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| Line of credit | Alternate base rate | Maximum |
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| Debt Instruments |
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| Margin (as a percent) |
1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= p_DebtInstrumentVariableRateBaseAlternateBaseRateMember
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2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= p_DebtInstrumentVariableRateBaseAlternateBaseRateMember
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| Line of credit | Variable rate base, federal funds effective rate |
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| Debt Instruments |
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| Variable interest rate base |
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federal funds effective rate
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| Margin (as a percent) |
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0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= p_DebtInstrumentVariableRateBaseFederalFundsEffectiveRateMember
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| Line of credit | Variable rate base, adjusted LIBOR rate |
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| Debt Instruments |
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| Variable interest rate base |
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adjusted LIBOR rate
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| Margin (as a percent) |
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1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= p_DebtInstrumentVariableRateBaseAdjustedLIBORateMember
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| Letter of credit |
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| Debt Instruments |
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| Maximum borrowings available |
15,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
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5,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
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| Line of credit facility, used capacity commitment fee percentage, increase (decrease) |
0.75%p_LineOfCreditFacilityUsedCapacityCommitmentFeePercentageIncreaseDecrease
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
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| Outstanding amount |
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$ 1,100,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
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$ 1,100,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
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| Letter of credit | Minimum |
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| Debt Instruments |
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| Line of credit facility, used capacity commitment fee percentage |
2.00%p_LineOfCreditFacilityUsedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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2.75%p_LineOfCreditFacilityUsedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Letter of credit | Maximum |
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| Debt Instruments |
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| Line of credit facility, used capacity commitment fee percentage |
2.25%p_LineOfCreditFacilityUsedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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3.00%p_LineOfCreditFacilityUsedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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