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Other Intangible Assets - Summary of Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule    
2016 $ 2,152  
2017 8,479  
2018 8,322  
2019 8,085  
2020 6,079  
Thereafter 53,389  
Total amortization expense $ 86,506 $ 60,180