Restructuring Related Balance Sheet Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2018			$ 40,125
Costs charged to expense	$ 666	$ (678)	82,908	$ 7,417
Cash (payments) receipts			(27,448)
Net assets disposed and impaired			(900)
Effect of change in exchange rates			(3,998)
Ending balance, September 30, 2018	90,687		90,687
Accrued Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2018			37,654
Costs charged to expense			79,011
Cash (payments) receipts			(23,302)
Net assets disposed and impaired			0
Effect of change in exchange rates			(3,996)
Ending balance, September 30, 2018	89,367		89,367
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2018			0
Costs charged to expense			568
Cash (payments) receipts			332
Net assets disposed and impaired			(900)
Effect of change in exchange rates			0
Ending balance, September 30, 2018	0		0
Other Accrued Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2018			2,471
Costs charged to expense			3,329
Cash (payments) receipts			(4,478)
Net assets disposed and impaired			0
Effect of change in exchange rates			(2)
Ending balance, September 30, 2018	$ 1,320		$ 1,320