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, 2013	1,985	1,435
Beginning Balances at Dec. 31, 2013	$ 342	$ (57,302)	$ 31,592		$ 174,362	$ 148,994
Net Income					27,808	27,808
Other comprehensive income (loss)				$ (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 (loss)				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
Net Income					27,581	27,581
Other comprehensive income (loss)				(757)		(757)
Stock-based compensation transactions (in shares)	7	(7)
Stock-based compensation transactions		$ 102	1,503			1,605
Shares surrendered in stock transactions (in shares)	(3)	3
Shares surrendered in stock transactions		$ (1,112)				(1,112)
Purchase of treasury stock (in shares)	(4)	4
Purchase of treasury stock		$ (1,276)				(1,276)
Dividends					(7,151)	(7,151)
Ending Balances (in shares) at Dec. 31, 2016	1,824	1,596
Ending Balances at Dec. 31, 2016	$ 342	$ (114,274)	$ 37,448	$ (474)	$ 239,946	$ 162,988