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Intangible Assets (Expected Amortization Expense) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
2019 $ 23,234  
2020 23,234  
2021 22,812  
2022 22,389  
2023 22,389  
Thereafter 176,555  
Intangible assets, net $ 290,613 $ 314,458