Segment Information Revenues By Region (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Revenues from External Customers [Line Items]
Revenue, Net		$ 477,592	$ 497,590
United States and Canada [Member]
Revenues from External Customers [Line Items]
Revenue, Net		269,097	262,037
Europe, Middle East, and Africa [Member]
Revenues from External Customers [Line Items]
Revenue, Net		162,815	195,710
Other [Member]
Revenues from External Customers [Line Items]
Revenue, Net	[1]	$ 45,680	$ 39,843

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