Other Income (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Income from Third Party License Fees	$ 862	$ 861	$ 978
Foreign Exchange Gains (Losses), Net	(807)	891	172
(Loss) Gain on Fixed Asset Disposals, Net	657	(79)	50
Non-Income Tax Refunds and Other Related Credits	668	1,015	398
Pension And Post Retirement Benefit Costs Nonservice Components	(2,285)	(4,234)	(2,302)
Insurance Solvency Recovery	90	600	0
Other Nonoperating Income	425	380	338
Other Nonoperating Expense	(252)	(152)	(126)
Other Income (Expense), Net	$ (642)	(718)	$ (492)
Property Plant And Equipment Additional Disclosures	In addition, gain (loss) on fixed asset disposals, net, during the year ended December 31, 2018 and 2017 includes a $0.6 million gain and a $0.1 million loss, respectively, on the sale of held-for-sale assets in each period.
Foreign Currency Transactions Description	Foreign exchange (losses) gains, net, during the year ended December 31, 2018 include both a foreign currency transaction loss of approximately $0.4 million related to hyper-inflationary accounting for the Company’s Argentina subsidiary effective July 1, 2018 and a foreign currency transaction gain of approximately $0.4 million related to the liquidation of an inactive legal entity.
Defined Benefit Plan Benefit Obligation Increase Decrease For Remeasurement Due To Settlement		$ 1,900