Other Income (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Income from third party license fees	$ 1,035	$ 862	$ 861
Foreign exchange gains (losses), net	223	(807)	891
Gain (loss) on fixed asset disposals, net	58	657	(79)
Non-income tax refunds and other related credits	1,118	668	1,015
Pension and post retirement benefit costs, non-service components	(2,805)	(2,285)	(4,234)
Insurance solvency recovery	60	90	600
Other non-operating income	455	425	380
Other non-operating expense	(398)	(252)	(152)
Other Income (Expense), Net	$ (254)	(642)	(718)
Property Plant And Equipment Additional Disclosures	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 gains (losses), net, during the years ended December 31, 2019 and 2018, include foreign currency transaction losses of $1.0 million and $0.4 million, respectively, related to hyper-inflationary accounting for the Company’s Argentine subsidiaries, and specific to 2018, 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
Narrative [Abstract]
Foreign Currency Transaction Loss Before Tax	$ 1,000	400
Foreign Currency Transaction Gain, before Tax		400
Gain (loss) on disposition of assets		$ 600	$ (100)