Segment Information Revenues By Region (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues from External Customers [Line Items]
Revenue, Net		$ 506,859	$ 469,528	$ 1,517,473	$ 1,387,085
United States and Canada [Member]
Revenues from External Customers [Line Items]
Revenue, Net		297,116	256,962	837,468	737,112
Europe, Middle East, and Africa [Member]
Revenues from External Customers [Line Items]
Revenue, Net		161,959	167,577	545,517	514,054
Other [Member]
Revenues from External Customers [Line Items]
Revenue, Net	[1]	$ 47,784	$ 44,989	$ 134,488	$ 135,919

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