Restructuring and Other Related Charges (Summary of Accrued Restructuring Costs) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Restructuring Reserve [Roll Forward]
Balance at December 31, 2018		$ 35,189
Charges	$ 4,145	6,787
Cash payments		(21,520)
Non-cash adjustments		(3,247)
Currency translation		55
Balance at June 30, 2019	17,264	17,264
Severance and employee-related costs
Restructuring Reserve [Roll Forward]
Balance at December 31, 2018		33,774
Charges	1,300	5,220
Cash payments		(21,115)
Non-cash adjustments		(884)
Currency translation		39
Balance at June 30, 2019	17,034	17,034
Other related costs
Restructuring Reserve [Roll Forward]
Balance at December 31, 2018		1,415
Charges	13,000	1,567
Cash payments		(405)
Non-cash adjustments		(2,363)
Currency translation		16
Balance at June 30, 2019	$ 230	$ 230