Segment and Geographic Information Schedule of Revenue by Geographic Area (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 and Long-Lived Assets
Revenues	$ 2,626,323	$ 3,248,173	$ 5,627,258	$ 6,348,476
UNITED STATES
Revenues from External Customers and Long-Lived Assets
Revenues	1,330,543	1,613,417	2,864,489	3,155,443
GERMANY
Revenues from External Customers and Long-Lived Assets
Revenues	359,134	415,947	733,686	802,412
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets
Revenues	278,419	409,765	669,038	822,578
Other countries
Revenues from External Customers and Long-Lived Assets
Revenues	$ 658,227	$ 809,044	$ 1,360,045	$ 1,568,043