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Commitments and Contingencies (Future Minimum Lease Payments Required Under Leases) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
2020 $ 10,602  
2021 24,146  
2022 22,123  
2023 15,969  
2024 11,155  
Thereafter 25,034  
Total lease payments 109,029  
Less: Interest 10,047  
Present value of lease liabilities 98,982 $ 91,400
Legally binding minimum lease payments for leases signed but not yet commenced $ 2,200  
Weighted average remaining lease term 5 years 6 months  
Weighted average discount rate 5.54%