Other (Income) Expense (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Pension benefit expense		$ 10,738	$ 6,975	$ 12,616
Foreign currency (gain) loss		(7,361)	(11,258)	11,429
Legal settlement income		(1,247)	(7,541)	(2,456)
Gain on sale of business		(2,814)	0	0
Other items		(725)	(2,296)	(2,482)
Gain on previously held shares	$ 20,800	0	20,767	0
Loss on debt extinguishment		0	0	23,262
Settlement of contract escrow				(2,247)
Total other (income) expense		$ (1,409)	$ (34,887)	$ 40,122