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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of future amortization expenses    
2015 $ 1,535us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 1,510us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 1,281us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 1,223us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 1,140us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 3,103us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net Carrying Amount $ 9,792us-gaap_FiniteLivedIntangibleAssetsNet $ 11,749us-gaap_FiniteLivedIntangibleAssetsNet