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Related Party Transactions (Related Party Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | ---
Related party assets: |  |
Related party assets | $ 47,988 | $ 30,889
Blackwater [Member] |  |
Related party assets: |  |
Notes receivable | 37,840 | 25,158
Mercury [Member] |  |
Related party assets: |  |
Notes receivable | 9,720 | 7,234
Insurance Group [Member] |  |
Related party assets: |  |
U-Haul receivables | $ 428 | $ (1,503)

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