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(Amortization of Intangibles) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Estimated amortization expense    
Remainder 2016 $ 6,119  
2017 7,932  
2018 7,629  
2019 7,257  
2020 7,075  
2021 0  
Thereafter 27,459  
Net Carrying Value $ 63,471 $ 65,549