Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Pension and postretirement benefits [Abstract]
Amortization of net actuarial loss, Gross Amount	[1]	$ 110	$ 550
Amortization of net actuarial loss, Income Tax Provision	[1]	(28)	(139)
Amortization of net actuarial loss, Net Amount	[1]	82	411
Foreign currency translation, Gross Amount		(1,274)	129
Foreign currency translation, Income Tax Provision		0	0
Foreign currency translation, Net Amount		(1,274)	129
Total other comprehensive income, Gross Amount		(1,164)	679
Total other comprehensive income, Income Tax Provision		(28)	(139)
Total other comprehensive income (loss), net of taxes		$ (1,192)	$ 540

[1] Actuarial gains/(losses) are amortized into other income (expense). (See Note 13, Retirement Plans)