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Commitments and Contingencies (Operating Leases) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2019 $ 17,536
2020 14,826
2021 12,800
2022 11,202
2023 5,701
Thereafter 15,069
Total future operating lease payments $ 77,134