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Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Related party cost and expense: |  |
Related party expenses, total | $ 17,860 | $ 17,155
Blackwater [Member] |  |
Related party cost and expense: |  |
U-Haul lease expenses | 658 | 670
U-Haul commission expenses | $ 17,202 | $ 16,485

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- Definition Costs of sales and operating expenses for the period incurred from transactions with related parties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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