Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings
Beginning Balances at Dec. 31, 2010	$ 116,617	$ 342	$ (39,342)	$ 24,331	$ 131,286
Beginning Balances (in shares) at Dec. 31, 2010		2,016	1,404
Net Income	26,038				26,038
Tax benefit from stock-based compensation	79			79
Stock-based compensation transactions (in shares)		8	(8)
Stock-based compensation transactions	1,077		35	1,042
Shares surrendered in stock transactions	(78)		(78)
Purchase of treasury stock (in shares)		(8)	8
Purchase of treasury stock	(1,513)		(1,513)
Dividends	(3,706)				(3,706)
Ending Balances at Dec. 31, 2011	138,514	342	(40,898)	25,452	153,618
Ending Balances (in shares) at Dec. 31, 2011		2,016	1,404
Net Income	23,629				23,629
Tax benefit from stock-based compensation	1,412			1,412
Stock-based compensation transactions (in shares)		41	(41)
Stock-based compensation transactions	3,502		368	3,134
Shares surrendered in stock transactions (in shares)		(9)	9
Shares surrendered in stock transactions	(2,268)		(2,268)
Purchase of treasury stock (in shares)		(27)	27
Purchase of treasury stock	(5,344)		(5,344)
Dividends	(24,617)				(24,617)
Ending Balances at Dec. 31, 2012	134,828	342	(48,142)	29,998	152,630
Ending Balances (in shares) at Dec. 31, 2012		2,021	1,399
Net Income	26,582				26,582
Tax benefit from stock-based compensation	15			15
Stock-based compensation transactions (in shares)		1	(1)
Stock-based compensation transactions	1,615		36	1,579
Purchase of treasury stock (in shares)		(30)	30
Purchase of treasury stock	(9,196)		(9,196)
Dividends	(4,850)				(4,850)
Ending Balances at Dec. 31, 2013	$ 148,994	$ 342	$ (57,302)	$ 31,592	$ 174,362
Ending Balances (in shares) at Dec. 31, 2013		1,992	1,428