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, 2015	1,824	1,596
Beginning 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)	61	(61)
Stock-based compensation transactions		$ 583	11,282			11,865
Shares surrendered in stock transactions (in shares)	(33)	33
Shares surrendered in stock transactions		$ (17,972)				(17,972)
Dividends					(8,345)	(8,345)
Ending Balances (in shares) at Dec. 31, 2017	1,852	1,568
Ending Balances at Dec. 31, 2017	$ 342	$ (131,663)	48,730	(1,215)	268,194	184,388
Net Income					34,255	34,255
Reclass from adopting ASU 2016-01				1,215	(1,215)
Stock-based compensation transactions (in shares)	1	(1)
Stock-based compensation transactions		$ 26	1,661			1,687
Shares surrendered in stock transactions		$ (90)				(90)
Dividends					(9,473)	(9,473)
Ending Balances (in shares) at Dec. 31, 2018	1,853	1,567
Ending Balances at Dec. 31, 2018	$ 342	$ (131,727)	$ 50,391	$ 0	$ 291,761	$ 210,767