CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2012	$ 872,133	$ 484	$ (860)	$ 1,386,475	$ (542,799)	$ 28,833
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	117,634				117,634
Adjustment for fair value accounting of derivatives, net of tax	(30,228)
Foreign currency translation adjustment	(667)
Exercise of stock options and vesting of restricted stock	(3,126)	4		(3,130)
Amortization of stock compensation expense	15,424			15,424
Net tax impact from stock option exercises and restricted stock vesting	(884)			(884)
Ending Balance at Dec. 31, 2013	970,286	488	(860)	1,397,885	(425,165)	(2,062)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(189,543)				(189,543)
Adjustment for fair value accounting of derivatives, net of tax	88,178
Foreign currency translation adjustment	(2,801)
Exercise of stock options and vesting of restricted stock	(7,171)	3		(7,174)
Amortization of stock compensation expense	16,709			16,709
Net tax impact from stock option exercises and restricted stock vesting	(54)			(54)
Issuance of common stock	225,999	58		225,941
Ending Balance at Dec. 31, 2014	1,101,603	549	(860)	1,633,307	(614,708)	83,315
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,090,915)				(1,090,915)
Adjustment for fair value accounting of derivatives, net of tax	(62,758)
Foreign currency translation adjustment	(2,605)
Exercise of stock options and vesting of restricted stock	(2,638)	4		(2,642)
Amortization of stock compensation expense	17,524			17,524
Net tax impact from stock option exercises and restricted stock vesting	0
Ending Balance at Dec. 31, 2015	$ (39,789)	$ 553	$ (860)	$ 1,648,189	$ (1,705,623)	$ 17,952