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Supplemental Financial Information - Future Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Future estimated amortization expense    
Remainder of 2019 $ 593  
2020 940  
2021 353  
2022 244  
2023 244  
Thereafter 1,036  
Net Book Value $ 3,410 $ 3,751