Segment Information Revenues By Region (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues from External Customers [Line Items]
Revenues		$ 595,962	$ 486,747	$ 1,789,073	$ 1,467,421
United States and Canada [Member]
Revenues from External Customers [Line Items]
Revenues		376,676	259,796	1,080,709	824,630
Europe, Middle East, and Africa [Member]
Revenues from External Customers [Line Items]
Revenues		177,356	171,924	564,178	493,505
Other [Member]
Revenues from External Customers [Line Items]
Revenues	[1]	$ 41,930	$ 55,027	$ 144,186	$ 149,286

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