Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Beginning balance at Dec. 31, 2013	$ 3,757	$ 122,827	$ 106,209	$ 16,883	$ (11,558)	$ 238,118
Beginning balance (in shares) at Dec. 31, 2013	20,873,000				1,609,000
Acquisition of treasury shares					$ (1,805)	(1,805)
Acquisition of treasury shares (in shares)					181,000
Equity incentive plan activity		222				222
Stock options exercised		145			$ 1,010	1,155
Stock options, exercised (in shares)					(135,000)
Net income (loss)			13,429			13,429
Other comprehensive income, net of tax				918		918
Ending balance at Dec. 31, 2014	$ 3,757	123,194	119,638	17,801	$ (12,353)	252,037
Ending balance (in shares) at Dec. 31, 2014	20,873,000				1,655,000
Acquisition of treasury shares					$ (2,532)	(2,532)
Acquisition of treasury shares (in shares)					221,000
Equity incentive plan activity		383				383
Stock options exercised		(97)			$ 755	658
Stock options, exercised (in shares)					(100,000)
Net income (loss)			21,863			21,863
Other comprehensive income, net of tax				(10,383)		(10,383)
Ending balance at Dec. 31, 2015	$ 3,757	123,480	141,501	7,418	$ (14,130)	262,026
Ending balance (in shares) at Dec. 31, 2015	20,873,000				1,776,000
Acquisition of treasury shares					$ (6,117)	(6,117)
Acquisition of treasury shares (in shares)					562,000
Equity incentive plan activity		(118)				(118)
Stock options exercised		(196)			$ 662	$ 466
Stock options, exercised (in shares)					(77,000)	(70,000)
Net income (loss)			6,526			$ 6,526
Other comprehensive income, net of tax				2,953		2,953
Ending balance at Dec. 31, 2016	$ 3,757	$ 123,166	$ 148,027	$ 10,371	$ (19,585)	$ 265,736
Ending balance (in shares) at Dec. 31, 2016	20,873,000				2,261,000