Stockholders' Equity - Schedule of Change In Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 5,726	$ (23,438)	$ (41,070)	$ (9,361)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax	1,284	(1,068)	372	(1,811)
Amounts reclassified from accumulated other comprehensive loss, net of tax	25	23	75	69
Net current period other comprehensive income (loss)	1,309	(1,045)	447	(1,742)
Ending Balance	(7,261)	(35,381)	(7,261)	(35,381)
Defined Benefit Pension and Postretirement Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(7,021)	(9,107)	(7,071)	(9,153)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	25	23	75	69
Net current period other comprehensive income (loss)	25	23	75	69
Ending Balance	(6,996)	(9,084)	(6,996)	(9,084)
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(7,215)	(5,938)	(6,303)	(5,195)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax	1,284	(1,068)	372	(1,811)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Net current period other comprehensive income (loss)	1,284	(1,068)	372	(1,811)
Ending Balance	(5,931)	(7,006)	(5,931)	(7,006)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(14,236)	(15,045)	(13,374)	(14,348)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Ending Balance	$ (12,927)	$ (16,090)	$ (12,927)	$ (16,090)