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Goodwill and Other Intangible Assets - Estimated aggregate amortization expense for future periods (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 4,551  
2020 3,315  
2021 2,557  
2022 1,982  
2023 1,519  
Thereafter 3,036  
Intangible, net $ 16,960 $ 23,806