Segment Information (Revenues By Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 697,192	$ 662,677	[1]
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	697,192	662,677	[2]
Operating Segments [Member] | Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	414,000	391,346	[1]
Operating Segments [Member] | EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	214,575	201,852	[1]
Operating Segments [Member] | APJ [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 68,617	$ 69,479	[1]

[1] As noted above, prior period amounts have not been adjusted under the modified retrospective method. See Note 2 for further information regarding the Company’s adoption of the revenue recognition standard.

[2] Prior period amounts have not been adjusted under the modified retrospective method. See Note 2 for further information regarding the Company’s adoption of the revenue recognition standard.