Segment Information (Revenues By Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 860,945	$ 719,143
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	484,115	401,147
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	293,647	236,813
APJ [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 83,183	$ 81,183