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Schedule of Tangible Long-Lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets    
Long-Lived Assets $ 2,485,918 $ 1,220,162
UNITED STATES    
Revenues from External Customers and Long-Lived Assets    
Long-Lived Assets 1,424,978 620,125
UNITED KINGDOM    
Revenues from External Customers and Long-Lived Assets    
Long-Lived Assets 339,147 165,145
Other countries    
Revenues from External Customers and Long-Lived Assets    
Long-Lived Assets 416,351 217,416
GERMANY    
Revenues from External Customers and Long-Lived Assets    
Long-Lived Assets $ 305,442 $ 217,476