CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Comprehensive Income
Balance at Dec. 31, 2010	$ 101,821	$ 118	$ 908,837	$ (798,602)	$ (8,532)
Balance (in shares) at Dec. 31, 2010		11,893,000			1,123,000
Comprehensive income (loss):
Net income (loss) for the years ended December 31, 2011 and 2012	(59,503)			(59,503)		(59,503)
Comprehensive income (loss)	(59,503)					(59,503)
Stock-based compensation	4,115		4,115
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of withholding taxes	(962)	3	(965)
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of withholding taxes (in shares)		276,000
Purchase of treasury stock (in shares)	0
Balance at Dec. 31, 2011	45,471	121	911,987	(858,105)	(8,532)
Balance (in shares) at Dec. 31, 2011		12,169,000			1,123,000
Comprehensive income (loss):
Net income (loss) for the years ended December 31, 2011 and 2012	46,625			46,625		46,625
Comprehensive income (loss)	46,625					46,625
Stock-based compensation	4,756		4,756
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of withholding taxes	(814)	5	(819)
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of withholding taxes (in shares)		456,000
Purchase of treasury stock	(880)				(880)
Purchase of treasury stock (in shares)	65,218				65,000
Dividends	(12,236)		(12,236)
Balance at Dec. 31, 2012	$ 82,922	$ 126	$ 903,688	$ (811,480)	$ (9,412)
Balance (in shares) at Dec. 31, 2012		12,625,000			1,188,000