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, 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	(87,511)	0	(87,511)
Balance at Dec. 31, 2012	464	548,304	(478,334)	(2,168)	68,266
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(6,018)	0	(6,018)
Common stock repurchased for treasury	0	0	0	(2,475)	(2,475)
Balance at Dec. 31, 2013	$ 464	$ 548,304	$ (484,352)	$ (4,643)	$ 59,773