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Other Intangible Assets - Summary of Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule    
2016 $ 5,066  
2017 6,624  
2018 6,467  
2019 6,230  
2020 4,224  
Thereafter 29,883  
Total amortization expense $ 58,494 $ 60,180