Schedule of Tangible Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	$ 2,487,978	$ 2,542,911
UNITED STATES
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	1,429,743	1,467,701
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	295,658	330,113
Other countries
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	414,317	404,102
GERMANY
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	$ 348,260	$ 340,995