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(Amortization of Intangibles) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Estimated amortization expense    
Remainder 2016 $ 6,418  
2017 8,447  
2018 8,183  
2019 7,879  
2020 7,506  
2021 7,324  
Thereafter 27,790  
Net Carrying Value $ 73,547 $ 75,694