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(Amortization of Intangibles) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Estimated amortization expense    
Remainder 2016 $ 1,355  
2017 5,386  
2018 5,223  
2019 4,820  
2020 4,561  
Thereafter 9,649  
Net Carrying Value $ 30,994 $ 42,526