Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid In Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]	Total
Increase (Decrease) in Stockholders' Equity
Total stockholders' equity	$ 93	$ 359,018	$ (5,730)	$ 391,534	$ 744,915
Common Stock, Shares, Issued	92,460,824
Issuance of common stock	$ 2	9,893			9,895
Issuance of common stock (in shares)	2,315,859
Excess tax benefit (shortfall) related to restricted stock units and stock options exercised		6,879			6,879
Stock-based compensation		3,394			3,394
Net (loss) income				104,812	104,812
Other comprehensive loss			(4,459)		(4,459)
Total stockholders' equity	$ 95	379,184	(10,189)	496,346	865,436
Common Stock, Shares, Issued	94,776,683
Issuance of common stock	$ 2	9,641			9,643
Issuance of common stock (in shares)	2,233,603
Excess tax benefit (shortfall) related to restricted stock units and stock options exercised		10,235			10,235
Stock-based compensation		5,507			5,507
Net (loss) income				102,102	102,102
Other comprehensive loss			(633)		(633)
Total stockholders' equity	$ 97	404,567	(10,822)	598,448	$ 992,290
Common Stock, Shares, Issued	97,010,286				97,010,286
Issuance of common stock	$ 1	822			$ 823
Issuance of common stock (in shares)	527,838
Settlement on restricted stock tax withholding		(701)			(701)
Excess tax benefit (shortfall) related to restricted stock units and stock options exercised		(87)			(87)
Stock-based compensation		7,891			7,891
Net (loss) income				(154,744)	(154,744)
Other comprehensive loss			(27,899)		(27,899)
Total stockholders' equity	$ 98	$ 412,492	$ (38,721)	$ 443,704	$ 817,573
Common Stock, Shares, Issued	97,538,124				97,538,124