CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $) In Thousands, unless otherwise specified	Total	Accumulated Deficit [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2012	$ 313,971	$ (504,072)	$ 2,097	$ 815,946
Balance (in shares) at Dec. 31, 2012			20,968
Accumulated Other Comprehensive Income (Loss), Net of Tax	14				14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(59,492)	(59,492)
Stock options exercised, net	4,397		55	4,342
Stock options exercised, net (in shares)			551
Issuance of restricted stock, net	74			74
Stock-based compensation expense	1,808			1,808
Other Comprehensive Income (Loss), Net of Tax	14				14
Balance at Sep. 30, 2013	$ 260,772	$ (563,564)	$ 2,152	$ 822,170
Balance (in shares) at Sep. 30, 2013			21,519