Stockholders' Equity - Schedule of Change In Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ (16,187)	$ 29,551	$ (9,361)	$ 33,985
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax	(279)	(1,124)
Other comprehensive loss before reclassifications, net of tax			(743)	(1,999)
Amounts reclassified from accumulated other comprehensive loss, net of tax	23	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	23	0	46	0
Net current period other comprehensive income (loss)	(256)	(1,124)
Net current period other comprehensive income (loss)			(697)	(1,999)
Ending Balance	(23,438)	21,601	(23,438)	21,601
Defined Benefit Pension and Postretirement Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(9,130)	34	(9,153)	34
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax	0	0
Other comprehensive loss before reclassifications, net of tax			0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	23	0
Amounts reclassified from accumulated other comprehensive loss, net of tax			46	0
Net current period other comprehensive income (loss)	23	0
Net current period other comprehensive income (loss)			46	0
Ending Balance	(9,107)	34	(9,107)	34
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5,659)	(3,578)	(5,195)	(2,703)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax	(279)	(1,124)
Other comprehensive loss before reclassifications, net of tax			(743)	(1,999)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax			0	0
Net current period other comprehensive income (loss)	(279)	(1,124)
Net current period other comprehensive income (loss)			(743)	(1,999)
Ending Balance	(5,938)	(4,702)	(5,938)	(4,702)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(14,789)	(3,544)	(14,348)	(2,669)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Ending Balance	$ (15,045)	$ (4,668)	$ (15,045)	$ (4,668)