CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2010	$ 265,214	$ 37	$ (65,064)	$ 342,272	$ (12,031)	$ 0
Treasury Stock, Shares at Dec. 31, 2010			(4,121,123)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest					10,389
Net Income (Loss) Attributable to Parent	10,389
Other Comprehensive Income (Loss), Net of Tax						1
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1
Stock Repurchased and Retired During Period, Value	(12,573)		(12,573)
Stock Repurchased and Retired During Period, Shares			(889,511)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition				9,499
Share-based compensation expense	9,499
Stock Issued During Period, Value, Stock Options Exercised	2,737	1		2,736
Common stock issued under stock option and stock award plan, net of employees' taxes paid related to restricted stock units		641,074
Treasury Stock, Shares, Retired			(43,174)
Stock Issued During Period, Value, Employee Stock Purchase Plan	4,050			4,050
Stock Issued During Period, Shares, Employee Stock Purchase Plans		445,965
Increase to additional paid in capital from share-based compensation	2,900			3,597
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	3,597
Common Stock, Shares, Issued		38,235,745
Stockholders' Equity Attributable to Parent at Dec. 31, 2011	282,914	38	(77,637)	362,154	(1,642)	1
Treasury Stock, Shares at Dec. 31, 2011			(5,053,808)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest					16,178
Net Income (Loss) Attributable to Parent	16,178
Other Comprehensive Income (Loss), Net of Tax						130
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	130
Stock Repurchased and Retired During Period, Value	(12,363)		(12,363)
Stock Repurchased and Retired During Period, Shares			(898,168)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition				9,214
Share-based compensation expense	9,214
Stock Issued During Period, Value, Stock Options Exercised	4,548	1		4,547
Common stock issued under stock option and stock award plan, net of employees' taxes paid related to restricted stock units		879,875
Stock Issued During Period, Value, Employee Stock Purchase Plan	4,402			4,402
Stock Issued During Period, Shares, Employee Stock Purchase Plans		377,849
Increase to additional paid in capital from share-based compensation	2,600			2,527
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	2,527
Common Stock, Shares, Issued	39,493,469	39,493,469
Stockholders' Equity Attributable to Parent at Dec. 31, 2012	307,550	39	(90,000)	382,844	14,536	131
Common Stock, Shares, Outstanding at Dec. 31, 2012	33,541,493
Treasury Stock, Shares at Dec. 31, 2012	(5,951,976)		(5,951,976)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	23,979
Other Comprehensive Income (Loss), Net of Tax						40
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	40
Stock Repurchased and Retired During Period, Value	(20,962)		20,962
Stock Repurchased and Retired During Period, Shares			(884,645)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition				11,151
Share-based compensation expense	11,151
Stock Issued During Period, Value, Stock Options Exercised	18,884	2		18,882
Common stock issued under stock option and stock award plan, net of employees' taxes paid related to restricted stock units		1,897,931
Stock Issued During Period, Value, Employee Stock Purchase Plan	5,779			5,779
Stock Issued During Period, Shares, Employee Stock Purchase Plans		450,713
Increase to additional paid in capital from share-based compensation	2,400			2,576
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	2,576
Common Stock, Shares, Issued	41,842,113	41,842,113
Stockholders' Equity Attributable to Parent at Dec. 31, 2013	$ 348,997	$ 41	$ (110,962)	$ 421,232	$ 38,515	$ 171
Common Stock, Shares, Outstanding at Dec. 31, 2013	35,005,492
Treasury Stock, Shares at Dec. 31, 2013	(6,836,621)		(6,836,621)