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Leases - Summary of Operating Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Lessee Lease Description [Line Items]    
Operating lease right of use assets, gross $ 159,454  
Amortization of right-of-use assets (32,322)  
Total operating lease right-of-use assets 127,132 $ 133,965
Real Estate Facilities    
Lessee Lease Description [Line Items]    
Operating lease right of use assets, gross 157,010  
Office Equipment    
Lessee Lease Description [Line Items]    
Operating lease right of use assets, gross 1,864  
Other    
Lessee Lease Description [Line Items]    
Operating lease right of use assets, gross $ 580