Restructuring Related Balance Sheet Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2018	$ 40,125
Costs charged to expense	87,865	$ 3,052
Cash payments	(7,917)
Net assets disposed and impaired	(47)
Effect of change in exchange rates	1,568
Ending balance, March 31, 2018	121,594
Accrued Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2018	37,654
Costs charged to expense	86,986
Cash payments	(7,063)
Net assets disposed and impaired	0
Effect of change in exchange rates	1,566
Ending balance, March 31, 2018	119,143
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	47
Cash payments	0
Net assets disposed and impaired	(47)
Effect of change in exchange rates	0
Ending balance, March 31, 2018	0
Other Accrued Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2018	2,471
Costs charged to expense	832
Cash payments	(854)
Net assets disposed and impaired	0
Effect of change in exchange rates	2
Ending balance, March 31, 2018	$ 2,451