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Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue $ 1,416,971 $ 1,377,260 $ 1,318,641
Service Revenues [Member]      
Revenue 917,759 871,596 804,024
Commission Revenue [Member]      
Revenue 469,718 452,882 431,781
Fees Revenue [Member]      
Revenue 448,041 418,714 372,243
Inventory Sales Revenue [Member]      
Revenue $ 499,212 $ 505,664 $ 514,617