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Segment Information - Reportable Segment Total Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Total assets $ 5,263,491 $ 5,001,075
U.S.    
Segment Reporting Information [Line Items]    
Total assets 4,213,916 4,113,049
U.K.    
Segment Reporting Information [Line Items]    
Total assets 917,655 756,350
Brazil    
Segment Reporting Information [Line Items]    
Total assets $ 131,920 $ 131,676