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, 2014	1,913	1,507
Beginning 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		$ 37	1,849			1,886
Shares surrendered in stock transactions (in shares)	(1)	1
Shares surrendered in stock transactions		$ (154)				(154)
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
Net Income					36,593	36,593
Other comprehensive income (loss)				(741)		(741)
Stock-based compensation transactions (in shares)	46	(46)
Stock-based compensation transactions		$ 583	11,282			11,865
Shares surrendered in stock transactions (in shares)	(34)	34
Shares surrendered in stock transactions		$ (17,972)				(17,972)
Dividends					(8,345)	(8,345)
Ending Balances (in shares) at Dec. 31, 2017	1,836	1,584
Ending Balances at Dec. 31, 2017	$ 342	$ (131,663)	$ 48,730	$ (1,215)	$ 268,194	$ 184,388