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Intangible Assets - Schedule of Expected Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
2018 $ 18,003  
2019 17,498  
2020 15,472  
2021 14,775  
2022 13,956  
2023 and thereafter 58,521  
Amortization of Intangible Assets, Net $ 138,225 $ 155,058