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(Amortization of Intangibles) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Estimated amortization expense    
Remainder 2016 $ 5,072  
2017 6,447  
2018 6,265  
2019 5,826  
2020 5,462  
Thereafter 11,707  
Net Carrying Value $ 40,779 $ 42,526