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Intangible Assets - Future Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Amortization expense for each of the five years through December 31, 2018 and thereafter    
Six months ending December 31, 2014 $ 2,072  
2015 4,129  
2016 4,038  
2017 3,859  
2018 3,858  
Thereafter 12,049  
Total amortization expense $ 30,005 $ 31,834