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Goodwill and Intangible Assets, Net - Future Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2018 $ 15,219    
2019 13,644    
2020 12,217    
2021 11,062    
2022 and thereafter 42,144    
Net Carrying Value $ 94,286 $ 4,568 $ 6,318