Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning balance at Dec. 31, 2014	$ 1,076,659	$ 377	$ 600,643	$ 475,244	$ 395
Beginning balance, shares at Dec. 31, 2014	37,711,623
Net loss	(31,008)			(31,008)
Other comprehensive income, net of tax	27				27
Share-based compensation	3,423		3,423
Tax shortfall on share-based compensation	(278)		(278)
Issuance of shares under incentive plans	138		138
Issuance of shares under incentive plans, shares	20,606
Ending balance at Mar. 31, 2015	$ 1,048,961	$ 377	$ 603,926	$ 444,236	$ 422
Ending balance, shares at Mar. 31, 2015	37,732,229