Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2011	$ 78,298	$ 5	$ (1,667)	$ 166,814	$ (44)	$ (86,810)
Beginning balance, shares at Dec. 31, 2011		51,958	1,358
Net income	26,590					26,590
Other comprehensive income (loss)	(16)				(16)
Stock warrants exercised	263			263
Stock warrants exercised, shares		217
Fair value of warrant liability reclassified to additional paid-in capital	13,973			13,973
Stock options exercised	167			167
Stock options exercised, shares		67
Treasury stock purchased	(497)		(497)
Treasury stock purchased, shares			41
Restricted stock granted, Shares issued		676
Restricted stock forfeited, Share issued			19
Excess tax benefit related to share-based awards	579			579
Stock compensation expense	9,571			9,571
Return of borrowed shares under share lending agreement			659
Ending balance at Sep. 30, 2012	$ 128,928	$ 5	$ (2,164)	$ 191,367	$ 60	$ (60,220)
Ending balance, shares at Sep. 30, 2012		52,918	2,077