Segment Information Revenues By Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers [Line Items]
Revenues	$ 509,594	$ 635,037	$ 1,108,009	$ 1,249,613
United States and Canada [Member]
Revenues from External Customers [Line Items]
Revenues	369,862	417,909	755,187	815,475
Europe, Middle East, and Africa [Member]
Revenues from External Customers [Line Items]
Revenues	107,799	167,314	274,783	338,556
Other [Member]
Revenues from External Customers [Line Items]
Revenues	$ 31,933	$ 49,814	$ 78,039	$ 95,582