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Financial Instruments (Schedule of future minimum annual lease payments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Financial Instruments Schedule Of Future Minimum Annual Lease Payments Details  
2018 $ 2,473
2019 2,473
2020 2,520
2021 2,520
2022 7,373
Total minimum lease payments 17,359
Less: Amount representing interest (2,440)
Present value of minimum lease payments $ 14,919