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Goodwill and Intangible Assets - Summary of Estimated Amortization Expense for Future Years (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Amortization expense  
For the year ended December 31, 2016 $ 28,739
For the year ended December 31, 2017 27,381
For the year ended December 31, 2018 15,127
For the year ended December 31, 2019 1,751
For the year ended December 31, 2020 $ 1,659