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Related Party Transactions (Related Party Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Related party transactions: |  |  |  |
Management fee revenue | $ 9,651 | $ 8,765 | $ 26,847 | $ 23,952
Revenue from related parties | 9,651 | 8,765 | 26,847 | 23,952
Blackwater [Member] |  |  |  |
Related party transactions: |  |  |  |
Management fee revenue | 6,972 | 6,350 | 21,580 | 19,142
Mercury [Member] |  |  |  |
Related party transactions: |  |  |  |
Management fee revenue | $ 2,679 | $ 2,415 | $ 5,267 | $ 4,810

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