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(Amortization of Intangibles) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Estimated amortization expense    
Remainder 2016 $ 3,193  
2017 6,180  
2018 5,998  
2019 5,560  
2020 5,195  
Thereafter 11,018  
Net Carrying Value $ 37,144 $ 42,526