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Other Intangible Assets - Summary of Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule    
2016 $ 1,689  
2017 6,754  
2018 6,624  
2019 6,467  
2020 6,230  
Thereafter 34,105  
Total amortization expense $ 61,869 $ 66,943