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, 2011	$ 667,829	$ 481	$ (860)	$ 1,338,565	$ (692,225)	$ 21,868
Net income (loss)	149,426				149,426
Adjustment for fair value accounting of derivatives, net of tax	6,965					6,965
Exercise of stock options and vesting of restricted stock	(3,773)	3		(3,776)
Amortization of stock compensation expense	12,792			12,792
Net tax impact from stock option exercises and restricted stock vesting	814			814
Convertible notes offering	38,080			38,080
Ending Balance at Dec. 31, 2012	872,133	484	(860)	1,386,475	(542,799)	28,833
Net income (loss)	117,634				117,634
Adjustment for fair value accounting of derivatives, net of tax	(30,228)					(30,228)
Adjustment for foreign currency translation, net of tax	(667)					(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)
Net income (loss)	(189,543)				(189,543)
Adjustment for fair value accounting of derivatives, net of tax	88,178					88,178
Adjustment for foreign currency translation, net of tax	(2,801)					(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