CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings
Balance at Dec. 31, 2009	$ 148,977	$ 915		$ 94,465	$ 53,597
Balance (in shares) at Dec. 31, 2009		9,151
Increase (Decrease) in Stockholders' Equity
Options exercised, Stock award maturities, net of shares surrendered or withheld	(260)	8	(139)	(129)
Options exercised, Stock award maturities, net of shares surrendered or withheld (in shares)		80	(4)
Share awards and related compensation	1,505	1		1,504
Share awards and related compensation (in shares)		12
Tax benefit (loss) from exercise of non-qualified stock options	1,233			1,233
Net income	30,713				30,713
Balance at Dec. 31, 2010	182,168	924	(139)	97,073	84,310
Balance (in shares) at Dec. 31, 2010		9,243	(4)
Increase (Decrease) in Stockholders' Equity
Options exercised, Stock award maturities, net of shares surrendered or withheld	353	13	(292)	632
Options exercised, Stock award maturities, net of shares surrendered or withheld (in shares)		125	(9)
Share awards and related compensation	1,423	1		1,422
Share awards and related compensation (in shares)		13
Tax benefit (loss) from exercise of non-qualified stock options	1,551			1,551
Net income	20,802				20,802
Balance at Dec. 31, 2011	206,297	938	(431)	100,678	105,112
Balance (in shares) at Dec. 31, 2011	9,381	9,381	(13)
Increase (Decrease) in Stockholders' Equity
Options exercised, Stock award maturities, net of shares surrendered or withheld	70	1		69
Options exercised, Stock award maturities, net of shares surrendered or withheld (in shares)		11
Share awards and related compensation	(415)	3	(1,889)	1,471
Share awards and related compensation (in shares)		29	(78)
Special dividend	(18,648)				(18,648)
Tax benefit (loss) from exercise of non-qualified stock options	(273)			(273)
Net income	17,284				17,284
Balance at Dec. 31, 2012	$ 204,315	$ 942	$ (2,320)	$ 101,945	$ 103,748
Balance (in shares) at Dec. 31, 2012	9,421	9,421	(91)