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Intangible Assets (Estimated Future Amortization Expenses) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Intangible Assets [Abstract]    
2015 $ 190us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 83us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
Estimated future amortization expenses $ 273us-gaap_FiniteLivedIntangibleAssetsNet $ 677us-gaap_FiniteLivedIntangibleAssetsNet