Consolidated Statements of Shareholders Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Contributed Capital	Retained Earnings	Accumulated Other Comprehensive Earnings/(Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2014	$ 289,789	$ 299,892	$ 39,153	$ 380,145	$ (104,233)	$ (325,168)
Increase (Decrease) in Stockholders' Equity
Net (loss) earnings	6,954			6,954
Changes in fair market value of hedges, net of tax	157				157
Changes in unrealized pension cost, net of tax	6,809				6,809
Cumulative translation adjustment, net of tax	(1,738)				(1,738)
Cash dividends	(5,259)			(5,259)
Acquired shares for treasury stock	(18,088)					(18,088)
Stock Issued During Period, Value, Stock Options Exercised	64	64	0
Issued shares on vesting of restricted stock units	(542)	953	(1,495)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	313		313
Stock compensation	3,195		3,195
Ending balance at Dec. 31, 2015	281,654	300,909	41,166	381,840	(99,005)	(343,256)
Increase (Decrease) in Stockholders' Equity
Net (loss) earnings	34,380			34,380
Changes in fair market value of hedges, net of tax	553				553
Changes in unrealized pension cost, net of tax	6,412				6,412
Cumulative translation adjustment, net of tax	(1,154)				(1,154)
Cash dividends	(5,241)			(5,241)
Issued shares on vesting of restricted stock units	(1,384)	1,923	(3,307)
Stock compensation	2,662		2,662
Ending balance at Dec. 31, 2016	317,882	302,832	40,521	410,979	(93,194)	(343,256)
Increase (Decrease) in Stockholders' Equity
Net (loss) earnings	14,448			14,448
Changes in fair market value of hedges, net of tax	110				110
Changes in unrealized pension cost, net of tax	13,687				13,687
Cumulative translation adjustment, net of tax	437				437
Cash dividends	(5,267)			(5,267)
Issued shares on vesting of restricted stock units	(1,604)	1,945	(3,549)
Stock compensation	4,112		4,112
Ending balance at Dec. 31, 2017	$ 343,805	$ 304,777	$ 41,084	$ 420,160	$ (78,960)	$ (343,256)