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
Balance at Dec. 31, 2015	$ 3,757	$ 123,480	$ 141,501	$ 7,418	$ (14,130)
Acquisition of treasury stock					(5,792)
Shares issued under employee benefit plans					662
Equity based compensation		(21)
Shares issued under employee benefit plans (value)		(196)
Net (loss) income			10,188			$ 10,188
Additional minimum pension liability, net of tax				55
Unrealized holding gains arising during period, net of tax				5,049
Reclassification adjustment for losses (gains) included in net income, net of tax				(1,033)
Balance at Sep. 30, 2016	3,757	123,263	151,689	11,489	(19,260)	270,938
Balance at Jun. 30, 2016	3,757	123,650	146,641	10,864	(18,817)
Acquisition of treasury stock					(1,047)
Shares issued under employee benefit plans					604
Equity based compensation		(249)
Shares issued under employee benefit plans (value)		(138)
Net (loss) income			5,048			5,048
Additional minimum pension liability, net of tax				18
Unrealized holding gains arising during period, net of tax				1,325
Reclassification adjustment for losses (gains) included in net income, net of tax				(718)
Balance at Sep. 30, 2016	3,757	123,263	151,689	11,489	(19,260)	270,938
Balance at Dec. 31, 2016	3,757	123,166	148,027	10,371	(19,585)	265,736
Acquisition of treasury stock					(5,308)
Shares issued under employee benefit plans					265
Equity based compensation		97
Shares issued under employee benefit plans (value)		(107)
Net (loss) income			(924)			(924)
Additional minimum pension liability, net of tax				70
Unrealized holding gains arising during period, net of tax				5,335
Reclassification adjustment for losses (gains) included in net income, net of tax				(3,691)
Balance at Sep. 30, 2017	3,757	123,156	147,103	12,085	(24,628)	261,473
Balance at Jun. 30, 2017	3,757	123,110	148,663	13,933	(23,763)
Acquisition of treasury stock					(883)
Shares issued under employee benefit plans					18
Equity based compensation		51
Shares issued under employee benefit plans (value)		(5)
Net (loss) income			(1,560)			(1,560)
Additional minimum pension liability, net of tax				24
Unrealized holding gains arising during period, net of tax				200
Reclassification adjustment for losses (gains) included in net income, net of tax				(2,072)
Balance at Sep. 30, 2017	$ 3,757	$ 123,156	$ 147,103	$ 12,085	$ (24,628)	$ 261,473