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Goodwill and Other Intangibles - Estimated Intangible Asset Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
2019 $ 7,068    
2020 6,892    
2021 6,386    
2022 6,160    
2023 4,882    
Later 39,336    
Finite-Lived Intangible Assets, Net 70,724    
Customer Relationship Intangible      
Finite-Lived Intangible Assets [Line Items]      
2019 3,340    
2020 3,340    
2021 3,340    
2022 3,340    
2023 3,340    
Later 16,825    
Finite-Lived Intangible Assets, Net 33,525 $ 36,866 $ 40,206
Production and Supply Contract Intangibles      
Finite-Lived Intangible Assets [Line Items]      
2019 1,738    
2020 1,741    
2021 1,397    
2022 1,243    
2023 0    
Later 0    
Finite-Lived Intangible Assets, Net 6,119 7,850 8,282
Internally Developed Software Intangible      
Finite-Lived Intangible Assets [Line Items]      
2019 473    
2020 294    
2021 132    
2022 60    
2023 25    
Later 0    
Finite-Lived Intangible Assets, Net 984 1,420 2,083
Licenses      
Finite-Lived Intangible Assets [Line Items]      
2019 1,517    
2020 1,517    
2021 1,517    
2022 1,517    
2023 1,517    
Later 22,511    
Finite-Lived Intangible Assets, Net $ 30,096 $ 0 $ 0