CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings
Balance at Dec. 31, 2010	$ 200,101	$ 6	$ (10,496)	$ 368,254	$ (157,663)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock compensation plans	3,198	0	0	3,198	0
Surrender of stock to satisfy minimum tax withholding	(189)	0	(189)	0	0
Issuance of treasury stock for restricted stock vesting	0	0	224	(224)	0
Compensation under employee stock compensation plan	4,297	0	0	4,297	0
Net income (loss)	7,872				7,872
Net proceeds of public stock offering	0
Balance at Dec. 31, 2011	215,279	6	(10,461)	375,525	(149,791)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock compensation plans	8,611	0	0	8,611	0
Surrender of stock to satisfy minimum tax withholding	(174)	0	(174)	0	0
Issuance of treasury stock for restricted stock vesting	0		324	(324)	0
Compensation under employee stock compensation plan	4,986	0	0	4,986	0
Net income (loss)	64,707				64,707
Net proceeds of public stock offering	0
Balance at Dec. 31, 2012	293,409	6	(10,311)	388,798	(85,084)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock compensation plans	2,549	0	0	2,549	0
Compensation under employee stock compensation plan	9,498	0	0	9,498	0
Net income (loss)	(69,654)				(69,654)
Net proceeds of public stock offering	118,382	1	0	118,381	0
Exercise of warrants	399	0	0	399	0
Balance at Dec. 31, 2013	$ 354,583	$ 7	$ (10,311)	$ 519,625	$ (154,738)