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Intangible Assets (Schedule Of Estimated Future Amortization Expenses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Intangible Assets [Abstract]    
2019 $ 1,843  
2020 1,609  
2021 1,609  
2022 1,234  
2023 474  
2024 and thereafter 410  
Net Carrying Amount $ 7,179 $ 7,723