CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-In Capital	Other Comprehensive Income / Loss	Retained Earnings	Total
Beginning Balances (in shares) at Dec. 31, 2012	2,021	1,399
Beginning Balances at Dec. 31, 2012	$ 342	$ (48,142)	$ 29,998		$ 152,630	$ 134,828
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		$ 36	1,579			1,615
Purchase of treasury stock (in shares)	(37)	37
Purchase of treasury stock		$ (9,196)				(9,196)
Dividends					(4,850)	(4,850)
Ending Balances (in shares) at Dec. 31, 2013	1,985	1,435
Ending Balances at Dec. 31, 2013	$ 342	$ (57,302)	31,592		174,362	148,994
Net Income					27,808	27,808
Other comprehensive income				$ (245)		(245)
Tax benefit from stock-based compensation			168			168
Stock-based compensation transactions (in shares)	3	(3)
Stock-based compensation transactions		$ 61	2,180			2,241
Shares surrendered in stock transactions (in shares)	(1)	1
Shares surrendered in stock transactions		$ (376)				(376)
Purchase of treasury stock (in shares)	(74)	74
Purchase of treasury stock		$ (23,556)				(23,556)
Ending Balances (in shares) at Dec. 31, 2014	1,913	1,507
Ending Balances at Dec. 31, 2014	$ 342	$ (81,173)	33,940	(245)	196,706	149,570
Net Income					28,925	28,925
Other comprehensive income				528		528
Tax benefit from stock-based compensation			156			156
Stock-based compensation transactions (in shares)	1	(1)
Stock-based compensation transactions		$ (154)				(154)
Shares surrendered in stock transactions (in shares)	(1)	1
Shares surrendered in stock transactions		$ 37	1,849			1,886
Purchase of treasury stock (in shares)	(89)	89
Purchase of treasury stock		$ (30,698)				(30,698)
Dividends					(6,115)	(6,115)
Ending Balances (in shares) at Dec. 31, 2015	1,824	1,596
Ending Balances at Dec. 31, 2015	$ 342	$ (111,988)	$ 35,945	$ 283	$ 219,516	$ 144,098