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, 2013	$ 3,757	$ 122,827	$ 106,209	$ 16,883	$ (11,558)
Acquisition of treasury stock					(1,395)
Stock options exercised		(1)			16
Equity based compensation		87
Net income			9,662			$ 9,662
Additional minimum pension liability, net of tax				79
Unrealized holding (losses) gains arising during period, net of tax				1,235
Reclassification adjustment for (gains) losses included in net income, net of tax				79
Balance at Sep. 30, 2014	3,757	122,913	115,871	18,276	(12,937)	247,880
Balance at Jun. 30, 2014	3,757	123,048	112,408	18,379	(12,278)
Acquisition of treasury stock					(659)
Equity based compensation		(135)
Net income			3,463			3,463
Additional minimum pension liability, net of tax				26
Unrealized holding (losses) gains arising during period, net of tax				(144)
Reclassification adjustment for (gains) losses included in net income, net of tax				15
Balance at Sep. 30, 2014	3,757	122,913	115,871	18,276	(12,937)	247,880
Balance at Dec. 31, 2014	3,757	123,194	119,638	17,801	(12,353)	252,037
Acquisition of treasury stock					(1,910)
Stock options exercised		(114)			716
Equity based compensation		526
Net income			18,417			18,417
Additional minimum pension liability, net of tax				51
Unrealized holding (losses) gains arising during period, net of tax				(5,108)
Reclassification adjustment for (gains) losses included in net income, net of tax				(3,823)
Balance at Sep. 30, 2015	3,757	123,606	138,055	8,921	(13,547)	260,792
Balance at Jun. 30, 2015	3,757	123,618	131,357	15,956	(12,376)
Acquisition of treasury stock					(1,180)
Stock options exercised		(1)			9
Equity based compensation		(11)
Net income			6,698			6,698
Additional minimum pension liability, net of tax				17
Unrealized holding (losses) gains arising during period, net of tax				(7,034)
Reclassification adjustment for (gains) losses included in net income, net of tax				(18)
Balance at Sep. 30, 2015	$ 3,757	$ 123,606	$ 138,055	$ 8,921	$ (13,547)	$ 260,792