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Related Party Transactions (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Related Party Transaction    
Operating lease right-of-use assets $ 273,997 $ 264,880
Operating lease liabilities 280,210 $ 270,014
Rent expense 800  
Office Space and Fitness Facility    
Related Party Transaction    
Operating lease right-of-use assets 7,400  
Operating lease liabilities $ 7,500