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Commitments and Contingencies (Operating Leases) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2018 $ 756
2019 756
2020 737
2021 4,669
2022 76
Thereafter 0
Total 6,994
Less: Interest (542)
Present Value of Net Future Minimum Lease Payments $ 6,452