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Commitments and Contingencies (Future Minimum Lease Payments Required Under Leases) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]    
Remainder of 2019 $ 13,802  
2020 22,212  
2021 20,306  
2022 18,996  
2023 13,328  
Thereafter 26,508  
Total lease payments 115,152  
Less: Interest 18,376  
Present value of lease liabilities 96,776 $ 91,400
Legally binding minimum lease payments for leases signed but not yet commenced $ 4,100  
Weighted average remaining lease term 6 years 1 month 6 days  
Weighted average discount rate 5.70%