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Supplemental Financial Information - Future Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Future estimated amortization expense    
Remainder of 2018 $ 384  
2019 863  
2020 578  
2021 233  
2022 131  
Thereafter 131  
Net Book Value $ 2,320 $ 1,498