Restructuring Related Balance Sheet Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2019	$ 75,568
Costs charged to expense	7,262	$ 87,865
Cash (payments) receipts	(10,109)
Net assets disposed and impaired	0
Effect of change in exchange rates	(812)
Ending balance, March 31, 2019	71,909
Accrued Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2019	72,152
Costs charged to expense	2,224
Cash (payments) receipts	(4,088)
Net assets disposed and impaired	0
Effect of change in exchange rates	822
Ending balance, March 31, 2019	69,466
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2019	0
Costs charged to expense	96
Cash (payments) receipts	0
Net assets disposed and impaired	0
Effect of change in exchange rates	0
Ending balance, March 31, 2019	96
Other Accrued Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2019	3,416
Costs charged to expense	4,942
Cash (payments) receipts	(6,021)
Net assets disposed and impaired	0
Effect of change in exchange rates	(10)
Ending balance, March 31, 2019	$ 2,347