Stockholders' Equity - Schedule of Change In Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ (23,438)	$ 21,601	$ (9,361)	$ 33,985
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax	(1,068)	(1,014)
Other comprehensive loss before reclassifications, net of tax			(1,811)	(3,013)
Amounts reclassified from accumulated other comprehensive loss, net of tax	23	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	23	0	69	0
Net current period other comprehensive income (loss)	(1,045)	(1,014)	(1,742)	(3,013)
Ending Balance	(35,381)	15,592	(35,381)	15,592
Other Comprehensive Income (Loss), Net of Tax	(1,045)	(1,014)	(1,742)	(3,013)
Defined Benefit Pension and Postretirement Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(9,107)	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			69	0
Net current period other comprehensive income (loss)	23	0	69	0
Ending Balance	(9,084)	34	(9,084)	34
Other Comprehensive Income (Loss), Net of Tax	23	0	69	0
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5,938)	(4,702)	(5,195)	(2,703)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss before reclassifications, net of tax	(1,068)	(1,014)
Other comprehensive loss before reclassifications, net of tax			(1,811)	(3,013)
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)	(1,068)	(1,014)	(1,811)	(3,013)
Ending Balance	(7,006)	(5,716)	(7,006)	(5,716)
Other Comprehensive Income (Loss), Net of Tax	(1,068)	(1,014)	(1,811)	(3,013)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(15,045)	(4,668)	(14,348)	(2,669)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Ending Balance	$ (16,090)	$ (5,682)	$ (16,090)	$ (5,682)