Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income	Total
Balance at Dec. 31, 2011	$ 435	$ (200,175)	$ 688,353	$ 265,317	$ 6,590	$ 760,520
Balance (in shares) at Dec. 31, 2011	38,768,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)				30,928		30,928
Other comprehensive loss, net of tax					(617)	(617)
Share-based compensation expense			14,268			14,268
Net issuance under employee stock plans	11		5,792			5,803
Net issuance under employee stock plans (in shares)	560,000
Change due to retirement of treasury stock	(53)	200,175		(200,122)
Retirement of treasury stock (in shares)		5,278,828
Prior period debt conversion adjustment			310			310
Balance at Dec. 31, 2012	393		708,723	96,123	5,973	811,212
Balance (in shares) at Dec. 31, 2012	39,328,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)				(42,263)		(42,263)
Other comprehensive loss, net of tax					(1,352)	(1,352)
Share-based compensation expense			13,130			13,130
Net issuance under employee stock plans	4		(501)			(497)
Net issuance under employee stock plans (in shares)	338,000
Balance at Dec. 31, 2013	397		721,352	53,860	4,621	780,230
Balance (in shares) at Dec. 31, 2013	39,666,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)				(66,940)		(66,940)
Other comprehensive loss, net of tax					(3,152)	(3,152)
Share-based compensation expense			18,813			18,813
Net issuance under employee stock plans	7		9,974			9,981
Net issuance under employee stock plans (in shares)	694,000
Balance at Dec. 31, 2014	$ 404		$ 750,139	$ (13,080)	$ 1,469	$ 738,932
Balance (in shares) at Dec. 31, 2014	40,360,000