Accumulated Other Comprehensive Income (Loss) by Component (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 3,128	$ 12,793
OCI before reclassifications	(5,053)	4,702
Amount reclassified from accumulated OCI	548	(62)
Other Comprehensive Loss	(4,505)	4,640
Ending Balance	(1,377)	17,433
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	8,898	12,244
OCI before reclassifications	1,664	7,447
Amount reclassified from accumulated OCI	0	0
Other Comprehensive Loss	1,664	7,447
Ending Balance	10,562	19,691
Accumulated Long-Term Notes Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(2,491)	2,662
OCI before reclassifications	(5,858)	(2,345)
Amount reclassified from accumulated OCI	0	0
Other Comprehensive Loss	(5,858)	(2,345)
Ending Balance	(8,349)	317
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(3,299)	(2,703)
OCI before reclassifications	(598)	(141)
Amount reclassified from accumulated OCI	429	167
Other Comprehensive Loss	(169)	26
Ending Balance	(3,468)	(2,677)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	20	590
OCI before reclassifications	(261)	(259)
Amount reclassified from accumulated OCI	119	(229)
Other Comprehensive Loss	(142)	(488)
Ending Balance	$ (122)	$ 102