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Goodwill and Other Intangible Assets - Amortization Expense Remaining (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Amortization expense remaining    
2016 $ 6,754  
2017 6,624  
2018 6,467  
2019 6,230  
2020 4,225  
Thereafter 29,880  
Net Amount $ 60,180 $ 66,943