Unaudited Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2013	$ 249,752	$ 6	$ (15,176)	$ 266,122	$ (359)	$ (841)
Beginning balance, shares at Dec. 31, 2013		58,266,000	5,394,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,018					12,018
Other comprehensive loss	(149)				(149)
Employee stock purchase plan	231			231
Employee stock purchase plan, shares			(8,000)
Common stock issued in payment of accrued liability	600			600
Common stock issued in payment of accrued liability, shares		27,000
Stock warrants exercised	1,545			1,545
Stock warrants exercised, shares		1,277,000
Stock options exercised	1,448			1,448
Stock options exercised, shares		283,000
Stock surrendered for exercise of stock options	(1,005)		(1,005)
Stock surrendered for exercise of stock options, shares			39,000
Restricted stock granted	0			0
Restricted stock granted, shares		284,000
Restricted stock forfeited, shares			2,000
Treasury stock acquired related to tax withholding for share-based awards	(4,045)		(4,045)
Treasury stock acquired related to tax withholding for share-based awards, shares			162,000
Excess tax benefit related to share-based awards	1,300			1,300
Stock compensation expense	2,334			2,334
Stock issued in EOGA acquisition	1,750	0		1,750
Stock issued in EOGA acquisition, shares		94,000
Ending balance at Mar. 31, 2014	$ 265,779	$ 6	$ (20,226)	$ 275,330	$ (508)	$ 11,177
Ending balance, shares at Mar. 31, 2014		60,231,000	5,589,000