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Intangible Assets - Schedule of Expected Amortization Expense with Respect to Intangible Assets (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortization expense for each of the five years through December 31, 2020 and thereafter    
2018 $ 3,861  
2019 3,791  
2020 3,787  
2021 2,922  
2022 327  
Thereafter 1,224  
Net Carrying Value $ 15,912 $ 19,774