Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Retained Earnings	Common Stock Held in Treasury	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2009	$ 30,575	$ 16,169	$ 28,263	$ (2,875)	$ (10,982)
Beginning Balance (in shares) at Dec. 31, 2009		26,588,000
Net income	44,478		44,478
Other comprehensive income (loss)	922				922
Dividends declared	(10,711)		(10,711)
Common stock issued from treasury stock, shares		467,000
Common stock issued from treasury stock	5,883		5,650	233
Non-cash share-based compensation	6,478		6,478
Excess tax benefits from share-based awards	26		26
Ending Balance at Dec. 31, 2010	77,651	16,169	74,184	(2,642)	(10,060)
Ending Balance (in shares) at Dec. 31, 2010		27,055,000
Net income	53,291		53,291
Other comprehensive income (loss)	(5,541)				(5,541)
Dividends declared	(10,879)		(10,879)
Common stock issued from treasury stock, shares		235,000
Common stock issued from treasury stock	3,347		3,229	118
Non-cash share-based compensation	8,020		8,020
Excess tax benefits from share-based awards	927		927
Ending Balance at Dec. 31, 2011	126,816	16,169	128,772	(2,524)	(15,601)
Ending Balance (in shares) at Dec. 31, 2011		27,290,000
Net income	56,931		56,931
Other comprehensive income (loss)	(832)				(832)
Dividends declared	(10,569)		(10,569)
Common stock repurchased, shares	(1,372,853)	(1,372,853)
Common stock repurchased	(50,025)		(49,339)	(686)
Common stock issued from treasury stock, shares		707,000
Common stock issued from treasury stock	20,246		19,893	353
Non-cash share-based compensation	9,188		9,188
Excess tax benefits from share-based awards	1,654		1,654
Ending Balance at Dec. 31, 2012	$ 153,409	$ 16,169	$ 156,530	$ (2,857)	$ (16,433)
Ending Balance (in shares) at Dec. 31, 2012		26,624,000