Restructuring and Other Related Charges (Summary of Accrued Restructuring and Other Related Costs) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Accrued restructuring costs, beginning balance		$ 27,628	$ 35,189
Charges		35,068	27,897	$ 45,847
Other			(2,092)
Cash payments		(31,736)	(32,311)
Non-cash adjustments		(5,359)	(1,081)
Currency translation		1	26
Accrued restructuring costs, ending balance	$ 35,189	25,602	27,628	35,189
Severance and Other Personnel Related Costs [Member]
Restructuring Reserve [Roll Forward]
Accrued restructuring costs, beginning balance		27,407	33,774
Charges		30,752	26,132	36,000
Other			(612)
Cash payments		(31,545)	(31,897)
Non-cash adjustments		(1,043)	0
Currency translation		0	10
Accrued restructuring costs, ending balance	33,774	25,571	27,407	33,774
Other Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Accrued restructuring costs, beginning balance		221	1,415
Charges	9,900	4,316	1,765
Other			(1,480)
Cash payments		(191)	(414)
Non-cash adjustments		(4,316)	(1,081)
Currency translation		1	16
Accrued restructuring costs, ending balance	$ 1,415	$ 31	$ 221	$ 1,415