Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Common stock [Member]	Additional paid-in capital [Member]	Accumulated deficit [Member]	Treasury stock [Member]	Total
Balance at Dec. 31, 2010	$ 464	$ 548,044	$ (534,859)	$ (2,109)	$ 11,540
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(1,893)	0	(1,893)
Stock-based compensation	0	120	0	0	120
Common stock repurchased for treasury					0
Balance at Dec. 31, 2011	464	548,164	(536,752)	(2,109)	9,767
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	145,929	0	145,929
Common stock repurchased for treasury	0	0	0	(489)	(489)
Stock options exercised	0	140	0	430	570
Cash dividend ($2.00 per common share)	0	0	(87,511)	0	(87,511)
Balance at Dec. 31, 2012	$ 464	$ 548,304	$ (478,334)	$ (2,168)	$ 68,266