Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands	Total	Common Stock Voting [Member]	Additional Paid-in Capital [Member]	Treasury Stock - Common Stock Voting [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2013	$ 310,362	$ 119	$ 295,557	$ (32,273)	$ 51,042	$ (4,083)
Net income	17,475				17,475
Cumulative translation adjustment and foreign currency exchange hedge, net of tax	(234)					(234)
Unrealized net gain on securities available-for-sale, net of tax	30					30
Stock-based compensation	2,316		2,316
Exercise of stock options	419		419
Withholding tax payments on restricted stock vesting and stock option exercises	(4,927)		(4,927)
Excess tax benefits from stock-based compensation	2,252		2,252
Repurchases of common stock	(3,386)			(3,386)
Cash dividend on common stock	(6,046)				(6,046)
Ending Balance at Mar. 31, 2014	$ 318,261	$ 119	$ 295,617	$ (35,659)	$ 62,471	$ (4,287)