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Intangible Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Amortization expense for each of the five years through December 31, 2018 and thereafter    
2015 $ 4,134us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 4,041us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 3,862us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 3,861us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 3,791us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 8,260us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net Carrying Value $ 27,949us-gaap_FiniteLivedIntangibleAssetsNet $ 31,834us-gaap_FiniteLivedIntangibleAssetsNet