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Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Estimated amortization expense    
2018 $ 2,425  
2019 2,433  
2020 2,440  
2021 2,447  
2022 2,441  
Thereafter 14,941  
Net $ 27,127 $ 29,470