CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 9 months ended Sep. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Accumulated Deficit [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2014	$ 257,827	$ (544,746)	$ 2,157	$ 819,757	$ (19,341)
Balance (in shares) at Dec. 31, 2014			21,573
Balance (in shares) at Dec. 31, 2014					921
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(45,253)	(45,253)
Stock options exercised, net	676			(1,051)	$ 1,727
Stock options exercised, net (in shares)					(83)
Repurchase of common stock	(1,748)				$ (1,748)
Repurchase of common stock (in shares)					99
Issuance of restricted stock, net	108			(1,175)	$ 1,283
Issuance of restricted stock, net (in shares)					(60)
Stock-based compensation expense	1,140			1,140
Balance at Sep. 30, 2015	$ 212,750	$ (589,999)	$ 2,157	$ 818,671	$ (18,079)
Balance (in shares) at Sep. 30, 2015			21,573
Balance (in shares) at Sep. 30, 2015					877