Segment Information Revenues By Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers [Line Items]
Revenues	$ 540,184	$ 624,474	$ 1,648,193	$ 1,874,087
United States and Canada [Member]
Revenues from External Customers [Line Items]
Revenues	354,841	405,973	1,110,028	1,221,448
Europe, Middle East, and Africa [Member]
Revenues from External Customers [Line Items]
Revenues	156,810	157,159	431,593	495,715
Other [Member]
Revenues from External Customers [Line Items]
Revenues	$ 28,533	$ 61,342	$ 106,572	$ 156,924