Segment Information Revenues By Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues from External Customers [Line Items]
Revenue, Net	$ 497,590	$ 446,746
United States and Canada [Member]
Revenues from External Customers [Line Items]
Revenue, Net	262,037	227,438
Europe, Middle East, and Africa [Member]
Revenues from External Customers [Line Items]
Revenue, Net	195,710	176,187
Other [Member]
Revenues from External Customers [Line Items]
Revenue, Net	$ 39,843	$ 43,121