Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [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		514
Shares issued under employee benefit plans					2,107
Shares issued under employee benefit plans		(587)
Net (loss) income			33,341			$ 33,341
Additional minimum pension liability, net of tax				85
Unrealized holding gains arising during period, net of tax				10,278
Reclassification adjustment for gains included in net income, net of tax				(3,457)
Ending balance at Sep. 30, 2019	3,757	123,095	194,536	246	(25,201)	296,433
Balance at Jun. 30, 2019	3,757	122,778	189,249	(1,047)	(25,201)
Equity based compensation		317
Net (loss) income			5,287			5,287
Additional minimum pension liability, net of tax				28
Unrealized holding gains arising during period, net of tax				1,404
Reclassification adjustment for gains included in net income, net of tax				(139)
Ending balance at Sep. 30, 2019	3,757	123,095	194,536	246	(25,201)	296,433
Balance at Dec. 31, 2019	3,757	123,468	160,570	688	(25,201)	263,282
Equity based compensation		(416)
Shares issued under employee benefit plans					175
Shares issued under employee benefit plans		(175)
Net (loss) income			(85,613)			(85,613)
Additional minimum pension liability, net of tax				82
Unrealized holding gains arising during period, net of tax				3,277
Reclassification adjustment for gains included in net income, net of tax				(4,433)
Ending balance at Sep. 30, 2020	3,757	122,877	74,957	(386)	(25,026)	176,179
Balance at Jun. 30, 2020	3,757	122,729	102,961	(2,243)	(25,032)
Equity based compensation		154
Shares issued under employee benefit plans					6
Shares issued under employee benefit plans		(6)
Net (loss) income			(28,004)			(28,004)
Additional minimum pension liability, net of tax				27
Unrealized holding gains arising during period, net of tax				2,138
Reclassification adjustment for gains included in net income, net of tax				(308)
Ending balance at Sep. 30, 2020	$ 3,757	$ 122,877	$ 74,957	$ (386)	$ (25,026)	$ 176,179