Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) |
9 Months Ended | 12 Months Ended | |||||||||||||||
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Sep. 30, 2015 |
Dec. 31, 2014 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2012 |
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Debt | |||||||||||||||||
Capital leases | [1] | $ 14,718,000 | $ 12,754,000 | ||||||||||||||
Total Debt | [1] | 5,405,967,000 | 4,501,345,000 | ||||||||||||||
Less: total current maturities | [1] | 5,646,000 | 7,482,000 | ||||||||||||||
Total long-term debt | [1] | $ 5,400,321,000 | 4,493,863,000 | ||||||||||||||
Senior Secured Revolving Credit Facility [Member] | |||||||||||||||||
Debt | |||||||||||||||||
Debt Instrument, Maturity Date | [2] | Jun. 16, 2020 | |||||||||||||||
Debt carrying amount | [1],[2] | $ 290,000,000 | $ 380,000,000 | ||||||||||||||
Credit facility, maximum borrowing capacity | $ 1,750,000,000 | [2] | $ 1,750,000,000 | $ 1,250,000,000 | |||||||||||||
Senior Notes [Member] | 4.25% Senior Notes Due 2020 [Member] | |||||||||||||||||
Debt | |||||||||||||||||
Interest rate on instrument | [3] | 4.25% | 4.25% | ||||||||||||||
Debt Instrument, Maturity Date | [3] | May 15, 2020 | May 15, 2020 | ||||||||||||||
Principal Amount | [3] | $ 500,000,000 | $ 500,000,000 | ||||||||||||||
Debt carrying amount | [1],[3] | $ 496,090,000 | $ 495,529,000 | ||||||||||||||
Senior Notes [Member] | 5.875% Senior Notes Due 2020 [Member] | |||||||||||||||||
Debt | |||||||||||||||||
Interest rate on instrument | [3] | 5.875% | 5.875% | ||||||||||||||
Debt Instrument, Maturity Date | [3] | Oct. 01, 2020 | Oct. 01, 2020 | ||||||||||||||
Principal Amount | [3] | $ 650,000,000 | $ 650,000,000 | ||||||||||||||
Debt carrying amount | [1],[3] | $ 644,482,000 | $ 643,790,000 | ||||||||||||||
Senior Notes [Member] | 5.75% Senior Notes Due 2021 [Member] | |||||||||||||||||
Debt | |||||||||||||||||
Interest rate on instrument | [3] | 5.75% | 5.75% | ||||||||||||||
Debt Instrument, Maturity Date | [3] | Aug. 01, 2021 | Aug. 01, 2021 | ||||||||||||||
Principal Amount | [3] | $ 600,000,000 | $ 600,000,000 | ||||||||||||||
Debt carrying amount | [1],[3] | $ 595,559,000 | $ 595,091,000 | ||||||||||||||
Senior Notes [Member] | 4.625% Senior Notes Due 2023 [Member] | |||||||||||||||||
Debt | |||||||||||||||||
Interest rate on instrument | [3] | 4.625% | 4.625% | ||||||||||||||
Debt Instrument, Maturity Date | [3] | May 15, 2023 | May 15, 2023 | ||||||||||||||
Principal Amount | [3] | $ 500,000,000 | $ 500,000,000 | ||||||||||||||
Debt carrying amount | [1],[3] | $ 495,478,000 | $ 495,116,000 | ||||||||||||||
Senior Notes [Member] | 6.00% Senior Note Due July 15, 2024 [Member] | |||||||||||||||||
Debt | |||||||||||||||||
Interest rate on instrument | [3] | 6.00% | 6.00% | ||||||||||||||
Debt Instrument, Maturity Date | [3] | Jul. 15, 2024 | Jul. 15, 2024 | ||||||||||||||
Principal Amount | [3] | $ 1,500,000,000 | $ 1,500,000,000 | ||||||||||||||
Debt carrying amount | [1],[3] | $ 1,484,869,000 | 1,483,918,000 | ||||||||||||||
Senior Notes [Member] | 5.375% Senior Notes Due 2025 [Member] | |||||||||||||||||
Debt | |||||||||||||||||
Interest rate on instrument | 5.375% | [3],[4] | 5.375% | ||||||||||||||
Debt Instrument, Maturity Date | [3],[4] | Apr. 15, 2025 | |||||||||||||||
Principal Amount | $ 1,000,000,000 | [3],[4] | $ 1,000,000,000 | ||||||||||||||
Debt carrying amount | [1],[3],[4] | $ 989,231,000 | $ 0 | ||||||||||||||
Senior Secured Notes [Member] | 5.25% Senior Notes Due 2022 [Member] | |||||||||||||||||
Debt | |||||||||||||||||
Interest rate on instrument | [3],[5] | 5.25% | 5.25% | ||||||||||||||
Debt Instrument, Maturity Date | [3],[5] | Aug. 15, 2022 | Aug. 15, 2022 | ||||||||||||||
Principal Amount | [3],[5] | $ 400,000,000 | $ 400,000,000 | ||||||||||||||
Debt carrying amount | [1],[3],[5] | $ 395,540,000 | $ 395,147,000 | ||||||||||||||
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