Long-Term Debt - 9.5% Senior Notes due 2018 (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Repayments of long-term debt		$ 0	$ 1,264,086	$ 4,800
Debt redemption premium		36,100
Loss on extinguishment of debt		0	$ 64,859	$ 58
Gain (loss) on extinguishment of debt, unamortized premium (discount)		(16,900)
Gain (loss) on extinguishment of debt, deferred financing costs		(11,900)
Senior Notes due October 2018, at a fixed rate of 9.5%
Debt Instrument [Line Items]
Repayments of long-term debt	$ 760,800
Senior note interest rate			9.50%
Gain (loss) on extinguishment of debt, make-whole premium	$ (36,100)
Amortization of debt discount		2,800	$ 3,500
Amortization of financing costs		2,200	$ 2,700
Amended Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding principal balance		463,600
Debt Redemption, After December 2013 and Before October 30, 2014
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ (64,900)