Segment Information Revenues By Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues from External Customers [Line Items]
Revenues	$ 486,949	$ 540,184	$ 1,495,935	$ 1,648,193
United States and Canada [Member]
Revenues from External Customers [Line Items]
Revenues	323,784	354,841	957,993	1,110,028
Europe, Middle East, and Africa [Member]
Revenues from External Customers [Line Items]
Revenues	126,548	156,810	437,768	431,593
Other [Member]
Revenues from External Customers [Line Items]
Revenues	$ 36,617	$ 28,533	$ 100,174	$ 106,572