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Intangible Assets (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Amortization expense for each of the five years through December 31, 2019 and thereafter    
Six months ending December 31, 2015 $ 2,066  
2016 4,041  
2017 3,862  
2018 3,861  
2019 3,791  
Thereafter 8,260  
Net carrying value $ 25,881 $ 27,949