Segment Information Revenues By Region (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers [Line Items]
Revenue, Net		$ 503,082	$ 513,024	$ 980,674	$ 1,010,614
United States and Canada [Member]
Revenues from External Customers [Line Items]
Revenue, Net		295,737	278,315	564,834	540,352
Europe, Middle East, and Africa [Member]
Revenues from External Customers [Line Items]
Revenue, Net		158,766	187,848	321,581	383,558
Other [Member]
Revenues from External Customers [Line Items]
Revenue, Net	[1]	$ 48,579	$ 46,861	$ 94,259	$ 86,704

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