CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance at Dec. 31, 2011	$ 492,638	$ 357	$ (367,121)	$ 607,676	$ (9,093)	$ 260,819
Treasury Stock, shares at Dec. 31, 2011			(8,903)
Common Stock, shares at Dec. 31, 2011		35,734
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	41,204					41,204
Other comprehensive income (loss), net of tax	4,296				4,296
Issuance of common stock through employee benefit plans	251	1		250
Issuance of common stock through employee benefit plans, shares		9
Share-based compensation	(20,614)	11		(20,625)
Share-based compensation, shares		1,109
Balance at Dec. 31, 2012	517,775	369	(367,121)	587,301	(4,797)	302,023
Treasury Stock, shares at Dec. 31, 2012			(8,903)
Common Stock, shares at Dec. 31, 2012		36,852
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(21,067)					(21,067)
Other comprehensive income (loss), net of tax	5,724				5,724
Issuance of common stock through employee benefit plans	234	0		234
Issuance of common stock through employee benefit plans, shares		6
Share-based compensation	10,966	1		10,965
Share-based compensation, shares		159
Issuance of common stock	152,458	40		152,418
Issuance of common stock, shares		4,025
Balance at Dec. 31, 2013	666,090	410	(367,121)	750,918	927	280,956
Treasury Stock, shares at Dec. 31, 2013	(8,903)		(8,903)
Common Stock, shares at Dec. 31, 2013		41,042
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	34,004					34,004
Other comprehensive income (loss), net of tax	(24,415)				(24,415)
Issuance of common stock through employee benefit plans	286	0		286
Issuance of common stock through employee benefit plans, shares		6
Share-based compensation	28,357	6		28,351
Share-based compensation, shares		596
Balance at Dec. 31, 2014	$ 704,322	$ 416	$ (367,121)	$ 779,555	$ (23,488)	$ 314,960
Treasury Stock, shares at Dec. 31, 2014	(8,903)		(8,903)
Common Stock, shares at Dec. 31, 2014		41,644