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Other Intangible Assets - Summary of Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule    
2016 $ 1,708  
2017 6,763  
2018 6,754  
2019 6,624  
2020 6,467  
Thereafter 40,336  
Total amortization expense $ 68,652 $ 64,370