Segment Information (Revenues By Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 798,929	$ 748,697	$ 1,659,874	$ 1,467,840
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	432,210	432,281	916,325	833,428
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	277,313	240,388	570,960	477,201
APJ [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 89,406	$ 76,028	$ 172,589	$ 157,211