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Goodwill and Intangible Assets, Net - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 5,715  
2019 5,608  
2020 5,536  
2021 5,447  
2022 5,428  
2023 and thereafter 11,697  
Amortization expense of intangible assets $ 39,431 $ 58,370