Restructuring Related Balance Sheet Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2018			$ 40,125
Costs charged to expense	$ (5,623)	$ 5,043	82,242	$ 8,095
Cash payments			(18,320)
Net assets disposed and impaired			(624)
Effect of change in exchange rates			(5,052)
Ending balance, June 30, 2018	98,371		98,371
Accrued Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2018			37,654
Costs charged to expense			79,660
Cash payments			(16,324)
Net assets disposed and impaired			0
Effect of change in exchange rates			(5,049)
Ending balance, June 30, 2018	95,941		95,941
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			624
Cash payments			0
Net assets disposed and impaired			(624)
Effect of change in exchange rates			0
Ending balance, June 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			1,958
Cash payments			(1,996)
Net assets disposed and impaired			0
Effect of change in exchange rates			(3)
Ending balance, June 30, 2018	$ 2,430		$ 2,430