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Goodwill and Intangible Assets Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Aggregate Amortization Expense [Abstract]        
Amortization expense $ 2,655 $ 2,921 $ 8,001 $ 8,758
Summary of the estimated annual amortization expense        
2015 10,579   10,579  
2016 10,579   10,579  
2017 8,556   8,556  
2018 4,441   4,441  
2019 $ 4,441   $ 4,441