Consolidated Statements of Stockholders' Equity - USD ($) $ 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)
Acquisition of treasury stock					(1,380)
Equity based compensation		57
Shares issued under employee benefit plans					2,107
Shares issued under employee benefit plans		(587)
Net (loss) income			15,025			$ 15,025
Additional minimum pension liability, net of tax				28
Unrealized holding (losses) gains arising during period, net of tax				6,141
Reclassification adjustment for gains included in net income, net of tax				(3,271)
Ending balance at Mar. 31, 2019	3,757	122,638	176,220	(3,762)	(25,201)	273,652
Balance at Dec. 31, 2019	3,757	123,468	160,570	688	(25,201)	263,282
Equity based compensation		(581)
Shares issued under employee benefit plans					169
Shares issued under employee benefit plans		(169)
Net (loss) income			(64,310)			(64,310)
Additional minimum pension liability, net of tax				27
Unrealized holding (losses) gains arising during period, net of tax				(5,520)
Reclassification adjustment for gains included in net income, net of tax				(4,452)
Ending balance at Mar. 31, 2020	$ 3,757	$ 122,718	$ 96,260	$ (9,257)	$ (25,032)	$ 188,446