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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Adoption of ASU 2016-15 (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Common shares of beneficial interest | $ 899,234 | $ 900,097 | $ 908,905 |  |
Noncontrolling interests – consolidated real estate entities | 6,747 | 8,888 | 9,204 |  |
Redeemable noncontrolling interests - consolidated real estate entities | 5,968 | 6,644 | 7,117 |  |
Total equity | 643,449 | 687,563 | 636,158 | $ 718,262 | $ 740,954
Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Common shares of beneficial interest |  | 907,843 | 916,121 |  |
Noncontrolling interests – consolidated real estate entities |  | 1,078 | 1,924 |  |
Redeemable noncontrolling interests - consolidated real estate entities |  | 6,708 | 7,181 |  |
Restatement Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Common shares of beneficial interest |  | (7,746) | (7,216) |  |
Noncontrolling interests – consolidated real estate entities |  | 7,810 | 7,280 |  |
Redeemable noncontrolling interests - consolidated real estate entities |  | (64) | (64) |  |
Common Stock |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total equity | 899,234 | 900,097 | 908,905 | 922,084 | 951,868
Common Stock | Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total equity |  | 907,843 | 916,121 |  |
Common Stock | Restatement Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total equity |  | (7,746) | (7,216) |  |
Noncontrolling Interest |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total equity | $ 74,663 | 81,900 | 82,437 | $ 99,504 | $ 88,844
Noncontrolling Interest | Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total equity |  | 74,090 | 75,157 |  |
Noncontrolling Interest | Restatement Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total equity |  | $ 7,810 | $ 7,280 |  |

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