Restructuring Related Balance Sheet Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2019			$ 75,568
Costs charged to expense	$ (6,169)	$ (5,623)	1,093	$ 82,242
Cash (payments) receipts			(10,829)
Net assets disposed and impaired			0
Effect of change in exchange rates			(119)
Ending balance, June 30, 2019	65,713		65,713
Accrued Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2019			72,152
Costs charged to expense			(605)
Cash (payments) receipts			(8,167)
Net assets disposed and impaired			0
Effect of change in exchange rates			130
Ending balance, June 30, 2019	63,250		63,250
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			(5,295)
Cash (payments) receipts			(12)
Net assets disposed and impaired			0
Effect of change in exchange rates			0
Ending balance, June 30, 2019	(5,307)		(5,307)
Other Accrued Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2019			3,416
Costs charged to expense			6,993
Cash (payments) receipts			(2,650)
Net assets disposed and impaired			0
Effect of change in exchange rates			(11)
Ending balance, June 30, 2019	$ 7,770		$ 7,770