Segment and Geographic Information Schedule of Revenue by Geographic Area (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 and Long-Lived Assets
Revenues	$ 3,047,684	$ 3,147,773	$ 8,674,942	$ 9,496,249
UNITED STATES
Revenues from External Customers and Long-Lived Assets
Revenues	1,463,063	1,579,691	4,327,563	4,735,134
GERMANY
Revenues from External Customers and Long-Lived Assets
Revenues	396,119	394,115	1,129,805	1,196,527
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets
Revenues	411,861	394,621	1,080,899	1,217,199
Other countries
Revenues from External Customers and Long-Lived Assets
Revenues	$ 776,641	$ 779,346	$ 2,136,675	$ 2,347,389