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Intangible Assets (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Estimated amortization expense:    
Remainder of 2018 $ 2,503  
2019 3,121  
2020 2,091  
2021 1,367  
2022 1,024  
Thereafter 2,871  
Total $ 12,977 $ 13,826