Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Beginning balance at Dec. 31, 2016	$ 3,757	$ 123,166	$ 148,027	$ 10,371	$ (19,585)	$ 265,736
Beginning balance (in shares) at Dec. 31, 2016	20,873				2,261
Acquisition of treasury shares					$ (5,308)	(5,308)
Acquisition of treasury shares (in shares)					484
Equity incentive plan activity		149				149
Shares issued under employee benefit plans		(135)			$ 366	231
Shares issued under employee benefit plans, shares					(41)
Net income (loss)			(11,553)			(11,553)
Other comprehensive (loss) income, net of tax				1,863		1,863
Ending balance at Dec. 31, 2017	$ 3,757	123,180	136,474	12,234	$ (24,527)	251,118
Ending balance (in shares) at Dec. 31, 2017	20,873				2,704
Reclassification of certain tax effects from accumulated other comprehensive income at January 1,2018			(2,619)	2,619
Acquisition of treasury shares					$ (1,807)	(1,807)
Acquisition of treasury shares (in shares)					187
Equity incentive plan activity		152				152
Shares issued under employee benefit plans		(164)			$ 406	242
Shares issued under employee benefit plans, shares					(45)
Net income (loss)			10,347			10,347
Other comprehensive (loss) income, net of tax				(4,520)		(4,520)
Ending balance at Dec. 31, 2018	$ 3,757	$ 123,168	161,195	(6,660)	$ (25,928)	$ 255,532
Ending balance (in shares) at Dec. 31, 2018	20,873				2,846
Cumulative effect of adoption of updated accounting guindance for equity financial instruments at January 1, 2018			$ 16,993	$ (16,993)