CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $) In Thousands, unless otherwise specified	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					921
Balance (in shares) at Dec. 31, 2014			21,573
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(14,603)	(14,603)
Stock options exercised, net	549		0	(411)	960
Stock options exercised, net (in shares)			0		(46)
Issuance of restricted stock, net	30			(180)	210
Issuance of restricted stock, net (in shares)					(10)
Stock-based compensation expense	257			257
Balance at Mar. 31, 2015	$ 244,060	$ (559,349)	$ 2,157	$ 819,423	$ (18,171)
Balance (in shares) at Mar. 31, 2015					865
Balance (in shares) at Mar. 31, 2015			21,573