Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income [Member]
Beginning balance, shares at Dec. 31, 2013	37,377,274
Beginning balance at Dec. 31, 2013	$ 1,167,016	$ 374	$ 580,572	$ 585,572	$ 498
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(110,328)			(110,328)
Other comprehensive income, net of tax	(103)				(103)
Share-based compensation	14,533		14,533
Excess tax benefit (tax shortfall) on share-based compensation	$ 42		42
Share-based compensation issuances, net, shares	334,349
Share-based compensation issuances, net	$ 5,499	3	5,496
Ending balance, shares at Dec. 31, 2014	37,711,623
Ending balance at Dec. 31, 2014	$ 1,076,659	377	600,643	475,244	395
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(263,190)			(263,190)
Other comprehensive income, net of tax	418				418
Share-based compensation	20,937		20,937
Excess tax benefit (tax shortfall) on share-based compensation	$ (1,367)		(1,367)
Share-based compensation issuances, net, shares	244,515
Share-based compensation issuances, net	$ (716)	2	(718)
Repurchase and cancellation of common stock under repurchase plan, shares	(2,382,733)
Repurchase and cancellation of common stock under repurchase plan	$ (28,065)	(24)	(28,041)
Ending balance, shares at Dec. 31, 2015	35,573,405
Ending balance at Dec. 31, 2015	$ 804,676	355	591,454	212,054	813
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(529,158)			(529,158)
Other comprehensive income, net of tax	120				120
Share-based compensation	6,568		6,568
Excess tax benefit (tax shortfall) on share-based compensation	$ (1,393)		(1,393)
Share-based compensation issuances, net, shares	817,724
Share-based compensation issuances, net	$ (553)	9	(562)
Ending balance, shares at Dec. 31, 2016	36,391,129
Ending balance at Dec. 31, 2016	$ 280,260	$ 364	$ 596,067	$ (317,104)	$ 933