Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Stock Trusts [Member]	Accumulated Other Comprehensive Income (loss) [Member]
Balance at Dec. 31, 2015	$ 117,717	$ 270	$ 125,226	$ 121,798	$ (60,275)	$ (54,662)	$ (14,640)
Balance, shares at Dec. 31, 2015		27,018,000			8,014,000	3,265,000
Employee Stock Purchase Plan share issuance	215		(211)		$ 426
Employee Stock Purchase Plan share issuance, shares					(44,000)
Stock Option Plan share issuance, net	262		(820)		$ 1,082
Stock Option Plan share issuance, shares					(95,000)
Excess tax benefits from equity-based compensation	(233)		(233)
Restricted stock plan share issuance/forfeiture	(382)		(1,241)		$ (1,286)	$ 2,145
Restricted stock plan share issuance/forfeiture, shares					259,000	(503,000)
Deferred compensation plan share issuance	549		(400)		$ 949
Deferred compensation plan share issuance, shares					105,000
Purchase of stock	(1,244)				$ (1,244)
Purchase of stock, shares					(287,000)
Termination of stock trusts	7				$ (52,510)	$ 52,517
Termination of stock trusts, shares					2,762,000	(2,762,000)
Equity-based compensation	1,626		1,626
Net income (loss)	(34,638)			(34,638)
Dividends declared	(2,937)			(2,937)
Foreign currency adjustment	(758)						(758)
Pension loss adjustment, net of tax	(1,365)						(1,365)
Balance at Dec. 31, 2016	78,819	$ 270	123,947	84,223	$ (112,858)		(16,763)
Balance, shares at Dec. 31, 2016		27,018,000			11,078,000
Employee Stock Purchase Plan share issuance	155		(133)		$ 288
Employee Stock Purchase Plan share issuance, shares					(29,000)
Stock Option Plan share issuance, net	734		(1,346)		$ 2,080
Stock Option Plan share issuance, shares					(195,000)
Restricted stock plan share issuance/forfeiture	(327)		(2,870)		$ 2,543
Restricted stock plan share issuance/forfeiture, shares					(182,000)
Deferred compensation plan share issuance	450		(410)		$ 860
Deferred compensation plan share issuance, shares					87,000
Purchase of stock	(6,159)				$ (6,159)
Purchase of stock, shares					(1,169,000)
Equity-based compensation	1,059		1,059
Net income (loss)	806			806
Foreign currency adjustment	2,481						2,481
Pension loss adjustment, net of tax	606						606
Balance at Dec. 31, 2017	$ 78,624	$ 270	120,247	85,029	$ (113,246)		(13,676)
Balance, shares at Dec. 31, 2017	27,017,824	27,018,000			11,754,000
Implementation of Accounting Standards	$ 73			336			(263)
Employee Stock Purchase Plan share issuance	93		(109)		$ 202
Employee Stock Purchase Plan share issuance, shares					(21,000)
Stock Option Plan share issuance, net	1,849		(1,589)		$ 3,438
Stock Option Plan share issuance, shares					(366,000)
Restricted stock plan share issuance/forfeiture	(1,849)		(4,475)		$ 2,626
Restricted stock plan share issuance/forfeiture, shares					(229,000)
Deferred compensation plan share issuance	1,519				$ 1,519
Deferred compensation plan share issuance, shares					159,000
Purchase of stock	(14,945)				$ (14,945)
Purchase of stock, shares					(1,767,000)
Equity-based compensation	2,353		2,353
Net income (loss)	(2,817)			(2,817)
Foreign currency adjustment	(2,059)						(2,059)
Pension loss adjustment, net of tax	1,387						1,387
Balance at Dec. 31, 2018	$ 64,228	$ 270	$ 116,427	$ 82,548	$ (120,406)		$ (14,611)
Balance, shares at Dec. 31, 2018	27,017,824	27,018,000			12,746,000