Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock [Member]	Paid-in capital [Member]	Treasury stock [Member]	Retained earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balances at Dec. 31, 2012	$ 57,372	$ 30,685	$ 550	$ (9,316)	$ 34,589	$ 864
Net Income	50,572				50,572
Comprehensive income (loss)	1,251					1,251
Dividends paid	(4,209)				(4,209)
Issuance of common stock		25	(25)
Stock based compensation	585	36	549
Purchases of treasury stock	(6)			(6)
Balances at Dec. 31, 2013	105,565	30,746	1,074	(9,322)	80,952	2,115
Net Income	45,370				45,370
Comprehensive income (loss)	(1,219)					(1,219)
Dividends paid	(8,409)				(8,409)
Issuance of common stock		20	(20)
Stock based compensation	1,485	91	1,394
Purchases of treasury stock	(5,631)			(5,631)
Balances at Dec. 31, 2014	137,161	30,857	2,448	(14,953)	117,913	896
Net Income	40,001				40,001
Comprehensive income (loss)	(3,339)					(3,339)
Dividends paid	(8,171)				(8,171)
Stock based compensation	494	28	466
Purchases of treasury stock	(35,065)			(35,065)
Balances at Dec. 31, 2015	$ 131,081	$ 30,885	$ 2,914	$ (50,018)	$ 149,743	$ (2,443)