Stockholders' Equity - Schedule of Change In Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ (27,122)	$ (16,187)	$ (41,070)	$ (9,361)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax			(912)	(743)
Amounts reclassified from accumulated other comprehensive loss, net of tax	25	23	50	46
Net current period other comprehensive income (loss)	61	(256)	(862)	(697)
Ending Balance	5,726	(23,438)	5,726	(23,438)
Other comprehensive loss before reclassifications, net of tax	36	(279)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	25	23
Defined Benefit Pension and Postretirement Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(7,046)	(9,130)	(7,071)	(9,153)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax			0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax			50	46
Net current period other comprehensive income (loss)	25	23	50	46
Ending Balance	(7,021)	(9,107)	(7,021)	(9,107)
Other comprehensive loss before reclassifications, net of tax	0	0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	25	23
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(7,251)	(5,659)	(6,303)	(5,195)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax			(912)	(743)
Amounts reclassified from accumulated other comprehensive loss, net of tax			0	0
Net current period other comprehensive income (loss)	36	(279)	(912)	(743)
Ending Balance	(7,215)	(5,938)	(7,215)	(5,938)
Other comprehensive loss before reclassifications, net of tax	36	(279)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	0	0
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(14,297)	(14,789)	(13,374)	(14,348)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Ending Balance	$ (14,236)	$ (15,045)	$ (14,236)	$ (15,045)