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Commitments and Contingencies (Future Minimum Lease Payments Required Under Leases) (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2019 $ 5,926
2020 21,539
2021 19,555
2022 18,011
2023 16,549
Thereafter 32,322
Total lease payments 113,902
Less: Interest 18,891
Present value of lease liabilities 95,011
Legally binding minimum lease payments for leases signed but not yet commenced $ 5,900
Weighted average remaining lease term 6 years 1 month 6 days
Weighted average discount rate 5.80%