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Goodwill and Other Intangible Assets - Estimated Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Remainder of 2019 $ 8,277  
2020 31,373  
2021 29,850  
2022 27,425  
2023 25,390  
2024 and thereafter 90,330  
Net Carrying Amount $ 212,645 $ 179,572