Segment Information Revenues By Region (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers [Line Items]
Revenue, Net		$ 607,221	$ 477,592
United States and Canada [Member]
Revenues from External Customers [Line Items]
Revenue, Net		355,932	269,096
Europe, Middle East, and Africa [Member]
Revenues from External Customers [Line Items]
Revenue, Net		202,074	162,815
Other [Member]
Revenues from External Customers [Line Items]
Revenue, Net	[1]	$ 49,215	$ 45,681

[1] The Other region includes our operations in Latin America and Asia Pacific.