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SHAREHOLDERS’ EQUITY (Details) - USD ($) |  |  |  | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 05, 2018 | Dec. 05, 2017 | Dec. 07, 2016 | Dec. 31, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Noncontrolling interests - Operating Partnership (in shares) |  |  |  | 1,367,502 | 1,409,943 | 1,561,722 |
Conversion of Units to Common Shares. [Abstract] |  |  |  |  |  |  |
Units converted to common stock (in shares) |  |  |  | 9,000 | 149,000 | 17,000 |
Units converted to common stock, aggregate cost |  |  |  | $ 499,000 | $ 8,775,000 | $ 966,000 |
Units converted to common stock, unit price (in dollars per share) |  |  |  | $ 53.12 | $ 58.90 | $ 58.40 |
Units converted to common stock |  |  |  | $ 0 | $ 0 | $ 0 | $ 0
Equity Awards |  |  |  |  |  |  |
Common shares outstanding (in shares) |  |  |  | 11,942,372 | 11,952,598 | 12,119,930 |
Share Repurchase Program |  |  |  |  |  |  |
Repurchase period | 1 year |  | 1 year |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |
Authorized share repurchase amount |  |  | $ 50,000,000 |  |  |  |
Repurchase period |  | 1 year |  |  |  |  |
Shares repurchased and retired (in shares) |  |  |  | 42,000 | 178,000 | 78,000 |
Shares repurchased and retired |  |  |  | $ 2,200,000 | $ 9,900,000 | $ 4,500,000 |
Shares repurchased and retired (in dollars per share) |  |  |  | $ 51.36 | $ 55.82 | $ 57.69 |
2015 Incentive Plan |  |  |  |  |  |  |
Equity Awards |  |  |  |  |  |  |
Forfeited (in shares) |  |  |  | 200 | 3,200 | 27,400 |
2015 Incentive Plan | Performance Shares |  |  |  |  |  |  |
Equity Awards |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 5,600 | 9,300 | 60,400 |
Shares issued |  |  |  | $ 347,000 | $ 536,000 | $ 2,600,000 |
2008 Incentive Award Plan |  |  |  |  |  |  |
Equity Awards |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  | 5,900 |
Shares issued |  |  |  |  |  | $ 352,000 |
Series C Preferred Stock |  |  |  |  |  |  |
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |  |  |  |  |
Preferred shares issued (in shares) |  |  |  | 4,118,460 | 4,118,460 | 0 |
Distribution rate percentage |  |  |  |  | 6.625% |  |
Liquidation preference per share (in dollars per share) |  |  |  |  |  | $ 25.00 |
Distribution accrual rate |  |  |  |  | $ 1.65625 |  |
Preferred shares liquidation preference |  |  |  |  |  | $ 102,971,475 |
Series B Preferred Stock |  |  |  |  |  |  |
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |  |  |  |  |
Preferred shares issued (in shares) |  |  |  | 0 | 0 | 4,600,000 |
Distribution rate percentage |  |  |  |  | 7.95% |  |
Preferred shares liquidation preference |  |  |  |  |  | $ 115,000,000 |
Shares redeemed (in shares) |  |  |  |  | 4,600,000 |  |
Series A Preferred Stock |  |  |  |  |  |  |
Cumulative Redeemable Preferred Shares of Beneficial Interest [Abstract] |  |  |  |  |  |  |
Distribution rate percentage |  |  |  |  |  | 8.25% |
Aggregate redemption price |  |  |  |  |  | $ 29,200,000 |
Exercise of Exchange Rights |  |  |  |  |  |  |
Conversion of Units to Common Shares. [Abstract] |  |  |  |  |  |  |
Units converted to common stock (in shares) |  |  |  | 33,000 | 3,000 | 50,000 |
Units converted to common stock |  |  |  | $ 649,000 | $ 34,000 | $ 875,000 |

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