Restructuring Related Balance Sheet Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2017			$ 47,970
Costs charged to expense	$ 5,043	$ (1,622)	8,095	$ 615
Cash payments			(9,605)
Non-cash items			(80)
Effect of change in exchange rates			2,967
Ending balance, June 30, 2017	49,347		49,347
Accrued Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, January 1, 2017			45,368
Costs charged to expense			5,507
Cash payments			(7,275)
Non-cash items			0
Effect of change in exchange rates			2,963
Ending balance, June 30, 2017	46,563		46,563
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			80
Cash payments			0
Non-cash items			(80)
Effect of change in exchange rates			0
Ending balance, June 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			2,508
Cash payments			(2,330)
Non-cash items			0
Effect of change in exchange rates			4
Ending balance, June 30, 2017	$ 2,784		$ 2,784