Accumulated Other Comprehensive Income (Loss) by Component - Changes in Accumulated Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 12,793	$ 36,870
OCI before reclassifications	(7,698)	(23,660)
Amount reclassified from accumulated OCI	(1,967)	(417)
Other Comprehensive Income (Loss)	(9,665)	(24,077)	$ 56,205
Ending balance	3,128	12,793	36,870
Foreign Currency
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	12,244	50,376
OCI before reclassifications	(3,346)	(38,132)
Amount reclassified from accumulated OCI	0	0
Other Comprehensive Income (Loss)	(3,346)	(38,132)
Ending balance	8,898	12,244	50,376
Long-Term Notes
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	2,662	(4,612)
OCI before reclassifications	(5,153)	7,274
Amount reclassified from accumulated OCI	0	0
Other Comprehensive Income (Loss)	(5,153)	7,274
Ending balance	(2,491)	2,662	(4,612)
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(2,703)	(7,652)
OCI before reclassifications	(1,157)	5,100
Amount reclassified from accumulated OCI	561	(151)
Other Comprehensive Income (Loss)	(596)	4,949
Ending balance	(3,299)	(2,703)	(7,652)
Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	590	(1,242)
OCI before reclassifications	1,958	2,098
Amount reclassified from accumulated OCI	(2,528)	(266)
Other Comprehensive Income (Loss)	(570)	1,832
Ending balance	$ 20	$ 590	$ (1,242)