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Commitments and Contingencies (Future Minimum Rental Commitments) (Details) - Operating Leases [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 6,695
2019 6,693
2020 5,416
2021 5,398
2022 5,515
Thereafter 6,801
Total minimum lease payments $ 36,518