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Commitments and Contingencies (Future Minimum Lease Payments Required Under Leases) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]    
Remainder of 2019 $ 10,603  
2020 22,651  
2021 20,755  
2022 19,424  
2023 13,755  
Thereafter 28,687  
Total lease payments 115,875  
Less: Interest 17,762  
Present value of lease liabilities 98,113 $ 91,400
Legally binding minimum lease payments for leases signed but not yet commenced $ 1,700  
Weighted average remaining lease term 5 years 7 months 6 days  
Weighted average discount rate 5.70%