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Intangible Assets (Schedule Of Estimated Future Amortization Expenses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets [Abstract]    
2018 $ 1,984  
2019 1,609  
2020 1,609  
2021 1,518  
2022 474  
2023 and thereafter 529  
Net Carrying Amount $ 7,723 $ 9,691