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Commitments and Contingent Liabilities (Schedule of Future Minimum Operating Lease) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]  
2019 $ 700
2020 800
2021 800
2022 800
2023 800
Thereafter $ 5,300