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Segment Operating Results - Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Segment Reporting Information [Line Items]      
Total Assets $ 3,271,888 $ 3,370,888 $ 2,645,458
United States [Member]      
Segment Reporting Information [Line Items]      
Total Assets 2,723,866 2,862,343  
Europe And Other [Member]      
Segment Reporting Information [Line Items]      
Total Assets $ 548,022 $ 508,545