Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock Voting	Common Stock Non-Voting	Additional Paid-In Capital	Treasury Stock - Common Stock Voting	Retained Earnings (Deficit)	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2011	$ 312,439	$ 113	$ 9	$ 340,716	$ (25,933)	$ (584)	$ (1,882)
Net income	13,493					13,493
Cumulative translation adjustment and foreign currency exchange hedge, net of tax	(132)						(132)
Unrealized net loss on securities available-for-sale, net of tax	(199)						(199)
Stock-based compensation	1,962			1,962
Exercise of stock options	326			326
Withholding tax payments on restricted stock vesting	(5,818)			(5,818)
Excess tax benefits from stock-based compensation	2,163			2,163
Conversion on common stock non-voting to common stock voting		2	(2)	(15,878)	15,878
Repurchases of common stock	(71,116)		(7)	(52,881)	(18,228)
Cash dividend on common stock	(4,201)					(4,201)
Balance at Mar. 31, 2012	$ 248,917	$ 115	$ 0	$ 270,590	$ (28,283)	$ 8,708	$ (2,213)