Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)

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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Federal tax expense, at statutory rate $ (312,188) $ (290,775) $ (222,982)
State income tax expense, net of federal benefit (26,018) (32,067) (19,031)
State rate changes 608 5,334 (8,666)
Non-deductible expenses (1,106) (13,914) (9,545)
Change in valuation allowance (44,100) 2,836 4,228
Other, net 564 (8,959) (3,881)
Total income tax expense $ (382,240) $ (337,545) $ (259,877)