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
Balance at Dec. 31, 2018	$ 3,757	$ 123,168	$ 161,195	$ (6,660)	$ (25,928)	$ 255,532
Beginning balance (in shares) at Dec. 31, 2018	20,873				2,846
Acquisition of treasury stock					$ (1,380)	(1,380)
Acquisition of treasury shares (in shares)					134
Equity incentive plan activity		887				887
Shares issued under employee benefit plans		(587)			$ 2,107	1,520
Shares issued under employee benefit plans, shares					(230)
Net loss			(625)			(625)
Other comprehensive (loss) income, net of tax				7,348		7,348
Ending balance at Dec. 31, 2019	$ 3,757	123,468	160,570	688	$ (25,201)	263,282
Ending balance (in shares) at Dec. 31, 2019	20,873				2,750
Equity incentive plan activity		(400)				(400)
Shares issued under employee benefit plans		(175)			$ 175
Shares issued under employee benefit plans, shares					(19)
Net loss			(91,655)			(91,655)
Other comprehensive (loss) income, net of tax				(305)		(305)
Ending balance at Dec. 31, 2020	$ 3,757	$ 122,893	$ 68,915	$ 383	$ (25,026)	$ 170,922
Ending balance (in shares) at Dec. 31, 2020	20,873				2,731