Consolidated Statements of Stockholders' Equity and Comprehensive Income (USD $) In Thousands, unless otherwise specified	Common Stock		Paid-in Capital		Accumulated Other Comprehensive Income	Retained Earnings	Total
Balance at Dec. 31, 2008	$ 102	[1]	$ 538		$ 778	$ 95,104	$ 96,522
Balance (in shares) at Dec. 31, 2008	25,812	[1]
Comprehensive income:
Net income						27,721	27,721
Foreign currency translation adjustment					299		299
Total comprehensive income							28,020
Stock options exercised and restricted stock awards vested, including tax benefits	1		1,938				1,939
Stock options exercised and restricted stock awards vested, including tax benefits (in shares)	255
Share-based compensation			848				848
Stock repurchased and retired	(1)		(2,680)			(448)	(3,129)
Stock repurchased and retired (in shares)	(246)
Dividends						(6,201)	(6,201)
Balance at Dec. 31, 2009	102		644		1,077	116,176	117,999
Balance (in shares) at Dec. 31, 2009	25,821
Comprehensive income:
Net income						21,894	21,894
Foreign currency translation adjustment					(1,077)	1,155	78
Total comprehensive income							21,972
Stock options exercised and restricted stock awards vested, including tax benefits			1,524				1,524
Stock options exercised and restricted stock awards vested, including tax benefits (in shares)	170
Share-based compensation			791				791
Stock repurchased and retired	(3)		(2,959)			(16,518)	(19,480)
Stock repurchased and retired (in shares)	(1,233)
Dividends						(6,067)	(6,067)
Balance at Dec. 31, 2010	99					116,640	116,739
Balance (in shares) at Dec. 31, 2010	24,758
Comprehensive income:
Net income						13,986	13,986
Total comprehensive income							13,986
Stock options exercised and restricted stock awards vested, including tax benefits			705				705
Stock options exercised and restricted stock awards vested, including tax benefits (in shares)	72
Share-based compensation			680				680
Stock repurchased and retired	(1)		(1,375)			(2,295)	(3,671)
Stock repurchased and retired (in shares)	(212)
Dividends			(10)	[2]		(5,925)	(5,935)
Balance at Dec. 31, 2011	$ 98					$ 122,406	$ 122,504
Balance (in shares) at Dec. 31, 2011	24,618

[1] Reflects 3-for-2 stock split effective June 13, 2011

[2] Includes cash payment of fractional shares resulting from 3-for-2 stock split effective June 13, 2011