Restructuring Related Balance Sheet Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2017			$ 47,970
Costs charged to expense	$ (678)	$ 40,679	7,417	$ 41,294
Cash payments			(12,356)
Non-cash items			720
Effect of change in exchange rates			4,149
Ending balance, September 30, 2017	47,900		47,900
Accrued Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2017			45,368
Costs charged to expense			4,832
Cash payments			(9,158)
Non-cash items			0
Effect of change in exchange rates			4,144
Ending balance, September 30, 2017	45,186		45,186
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2017			0
Costs charged to expense			(720)
Cash payments			0
Non-cash items			720
Effect of change in exchange rates			0
Ending balance, September 30, 2017	0		0
Other Accrued Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2017			2,602
Costs charged to expense			3,305
Cash payments			(3,198)
Non-cash items			0
Effect of change in exchange rates			5
Ending balance, September 30, 2017	$ 2,714		$ 2,714