Other - Other Income - Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Dividend and royalty income	$ (2,995)	$ (3,064)	$ (5,967)	$ (6,106)
Net expense from banking activities	2,694	2,196	7,380	7,181
Foreign currency transaction related losses (gains)	6,157	571	9,321	(2,039)
Miscellaneous pension income	(3,902)	(1,596)	(11,349)	(13,389)
Other income	(7,652)	(12,167)	(21,760)	(23,064)
Other expense	7,421	3,798	13,687	9,225
Total	$ 1,723	$ (10,262)	$ (8,688)	$ (28,192)