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Intangible Assets (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Estimated amortization expense    
April 1, 2017 through December 31, 2017 $ 1,774  
2018 2,373  
2019 2,379  
2020 2,386  
2021 2,392  
2022 2,385  
2023 and thereafter 15,197  
Net $ 28,886 $ 29,470