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Goodwill and Intangible Assets - Summary of Estimated Amortization Expense for Future Years (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Amortization expense  
For the year ended December 31, 2017 $ 38,579
For the year ended December 31, 2018 26,402
For the year ended December 31, 2019 8,066
For the year ended December 31, 2020 1,561
For the year ended December 31, 2021 $ 1,544