Other - Other Income - Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Dividend and royalty income	$ (1,451)	$ (1,844)
Net expense from banking activities	2,236	2,472
Foreign currency transaction related gains	(2,462)	(3,586)
Miscellaneous pension income	(3,544)	(1,067)
Other income	(7,109)	(4,960)
Other expense	3,058	3,551
Total	$ (9,272)	$ (5,434)