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Commitments and Contingencies (Schedule of Future Annual Minimum Lease Payments) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies [Abstract]  
2019 $ 6,930
2020 7,056
2021 7,272
2022 7,488
2023 7,704
Thereafter 31,518
Total minimum lease payments $ 67,968