Other Income (expense) - (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Income And Expenses [Abstract]
Income from third party license fees	$ 242	$ 144	$ 655	$ 583
Foreign exchange (losses) gains, net	376	(285)	(5)	(1,007)
Gain on fixed asset disposals, net	72	81	111	680
Non-income tax refunds and other related credits	82	127	1,047	668
Pension and post retirement benefit costs, non-service components	(513)	(568)	(2,304)	(1,713)
Other non-operating income	113	115	335	374
Other non-operating expense	(169)	(137)	(228)	(216)
Total other income (expense), net	$ 203	$ (523)	$ (389)	$ (631)
Property plant and equipment additional disclosures				Gain on fixed asset disposals, net, during the nine months ended September 30, 2018 includes a $0.6 million gain on the sale of an available-for-sale asset related to the Combination.
Foreign currency transactions description				Foreign exchange gains (losses), net during the three and nine months ended September 30, 2018 include a foreign currency transaction gain of approximately $0.4 million related to the liquidation of an inactive legal entity. In addition, foreign exchange gains (losses), net, in all periods includes losses related to hyper-inflationary accounting with respect to the Company’s Argentine subsidiaries.