Restructuring - Related Balance Sheet Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Beginning Balance	$ 75,568
Costs charged to expense	6,278	$ 77,183	$ 6,418
Cash (payments) receipts	(20,715)
Net assets disposed and impaired	3,715
Effect of change in exchange rates	(1,309)
Restructuring Reserve - Ending Balance	56,107	75,568
Employee severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Beginning Balance	72,152
Costs charged to expense	(608)
Cash (payments) receipts	(16,482)
Net assets disposed and impaired	0
Effect of change in exchange rates	(1,321)
Restructuring Reserve - Ending Balance	53,741	72,152
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Beginning Balance	0
Costs charged to expense	(1,785)
Cash (payments) receipts	(5,500)
Net assets disposed and impaired	3,715
Effect of change in exchange rates	0
Restructuring Reserve - Ending Balance	0	0
Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Beginning Balance	3,416
Costs charged to expense	8,671
Cash (payments) receipts	(9,733)
Net assets disposed and impaired	0
Effect of change in exchange rates	12
Restructuring Reserve - Ending Balance	$ 2,366	$ 3,416