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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Preferred Shares | Common Stock | Accumulated Distributions In Excess of Net Income | Accumulated Other Comprehensive Income | Noncontrolling Interest | Series A Preferred Stock | Series A Preferred Stock Accumulated Distributions In Excess of Net Income | Series B Preferred Stock | Series B Preferred Stock Accumulated Distributions In Excess of Net Income | Series C Preferred Stock | Series C Preferred Stock Preferred Shares | Series C Preferred Stock Accumulated Distributions In Excess of Net Income
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Balance at Apr. 30, 2015 | $ 740,954 | $ 138,674 | $ 951,868 | $ (438,432) | $ 0 | $ 88,844 |  |  |  |  |  |  |
Balance (in shares) at Apr. 30, 2015 |  |  | 12,446 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to controlling interest and noncontrolling interests | 76,568 |  |  | 72,006 |  | 4,562 |  |  |  |  |  |  |
Distributions – common shares and Units | (71,290) |  |  | (64,060) |  | (7,230) |  |  |  |  |  |  |
Distributions - preferred shares | (11,514) |  |  |  |  |  | $ (2,372) | $ (2,372) | $ (9,142) | $ (9,142) |  |  |
Distribution reinvestment and share purchase plan (in shares) |  |  | 82 |  |  |  |  |  |  |  |  |  |
Distribution reinvestment and share purchase plan | 5,619 |  | $ 5,619 |  |  |  |  |  |  |  |  |  |
Shares issued and share-based compensation (in shares) |  |  | 19 |  |  |  |  |  |  |  |  |  |
Shares issued and share-based compensation | 1,728 |  | $ 1,728 |  |  |  |  |  |  |  |  |  |
Partnership units issued | 18,226 |  |  |  |  | 18,226 |  |  |  |  |  |  |
Redemption of units for common shares (in shares) |  |  | 27 |  |  |  |  |  |  |  |  |  |
Redemption of Units for common shares | 0 |  | $ 1,477 |  |  | (1,477) |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  | (464) |  |  |  |  |  |  |  |  |  |
Shares repurchased | (35,000) |  | $ (35,000) |  |  |  |  |  |  |  |  |  |
Distributions to nonredeemable noncontrolling interests – consolidated real estate entities | (7,029) |  |  |  |  | (7,029) |  |  |  |  |  |  |
Adjustments to prior year redemption of Units for common shares | 0 |  | (3,608) |  |  | 3,608 |  |  |  |  |  |  |
Balance at Apr. 30, 2016 | 718,262 | 138,674 | $ 922,084 | (442,000) | 0 | 99,504 |  |  |  |  |  |  |
Balance (in shares) at Apr. 30, 2016 |  |  | 12,110 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to controlling interest and noncontrolling interests | 30,947 |  |  | 43,347 |  | (12,400) |  |  |  |  |  |  |
Distributions – common shares and Units | (63,360) |  |  | (55,907) |  | (7,453) |  |  |  |  |  |  |
Distributions - preferred shares | (10,546) |  |  |  |  |  | $ (1,403) | $ (1,403) | (9,143) | (9,143) |  |  |
Shares issued and share-based compensation (in shares) |  |  | 39 |  |  |  |  |  |  |  |  |  |
Shares issued and share-based compensation | 358 |  | $ 358 |  |  |  |  |  |  |  |  |  |
Redemption of units for common shares (in shares) |  |  | 50 |  |  |  |  |  |  |  |  |  |
Redemption of Units for common shares | 0 |  | $ 875 |  |  | (875) |  |  |  |  |  |  |
Redemption of units for cash | (966) |  |  |  |  | (966) |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  | (79) |  |  |  |  |  |  |  |  |  |
Shares repurchased | (33,253) | (27,317) | $ (4,501) | (1,435) |  |  |  |  |  |  |  |  |
Contributions from nonredeemable noncontrolling interests – consolidated real estate entities | 7,188 |  |  |  |  | 7,188 |  |  |  |  |  |  |
Conversion to equity of notes receivable from nonredeemable noncontrolling interests – consolidated real estate entities | (7,366) |  |  |  |  | (7,366) |  |  |  |  |  |  |
Acquisition of nonredeemable noncontrolling interests – consolidated real estate entities | (4,874) |  | $ (9,893) |  |  | 5,019 |  |  |  |  |  |  |
Other (in shares) |  |  | 0 |  |  |  |  |  |  |  |  |  |
Other | (232) |  | $ (18) |  |  | (214) |  |  |  |  |  |  |
Balance at Apr. 30, 2017 | 636,158 | 111,357 | $ 908,905 | (466,541) | 0 | 82,437 |  |  |  |  |  |  |
Balance (in shares) at Apr. 30, 2017 |  |  | 12,120 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to controlling interest and noncontrolling interests | 128,370 |  |  | 116,788 |  | 11,582 |  |  |  |  |  |  |
Other comprehensive income - derivative instrument | 1,779 |  |  |  | 1,779 |  |  |  |  |  |  |  |
Distributions – common shares and Units | (37,785) |  |  | (33,689) |  | (4,096) |  |  |  |  |  |  |
Distributions - preferred shares | (8,569) |  |  |  |  |  |  |  | $ (4,571) | $ (4,571) | $ (3,999) |  | $ (3,999)
Shares issued and share-based compensation (in shares) |  |  | 10 |  |  |  |  |  |  |  |  |  |
Shares issued and share-based compensation | 1,663 |  | $ 1,663 |  |  |  |  |  |  |  |  |  |
Issuance of Series C preferred shares |  |  |  |  |  |  |  |  |  |  | 99,456 | $ 99,456 |
Redemption of units for common shares (in shares) |  |  | 3 |  |  |  |  |  |  |  |  |  |
Redemption of Units for common shares | 0 |  | $ 34 |  |  | (34) |  |  |  |  |  |  |
Redemption of units for cash | (8,775) |  |  |  |  | (8,775) |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  | (178) |  |  |  |  |  |  |  |  |  |
Shares repurchased | (124,949) | (111,357) | $ (9,935) | (3,657) |  |  |  |  |  |  |  |  |
Contributions from nonredeemable noncontrolling interests – consolidated real estate entities | 619 |  |  |  |  | 619 |  |  |  |  |  |  |
Conversion to equity of notes receivable from nonredeemable noncontrolling interests – consolidated real estate entities | (246) |  |  |  |  | (246) |  |  |  |  |  |  |
Other (in shares) |  |  | (2) |  |  |  |  |  |  |  |  |  |
Other | (157) |  | $ (570) |  |  | 413 |  |  |  |  |  |  |
Balance at Apr. 30, 2018 | 687,563 | 99,456 | $ 900,097 | (395,669) | 1,779 | 81,900 |  |  |  |  |  |  |
Balance (in shares) at Apr. 30, 2018 |  |  | 11,953 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to controlling interest and noncontrolling interests | (4,878) |  |  | (4,398) |  | (480) |  |  |  |  |  |  |
Other comprehensive income - derivative instrument | (2,635) |  |  |  | (2,635) |  |  |  |  |  |  |  |
Distributions – common shares and Units | (27,977) |  |  | (25,060) |  | (2,917) |  |  |  |  |  |  |
Distributions - preferred shares | (4,547) |  |  |  |  |  |  |  |  |  | $ (4,548) |  | $ (4,548)
Shares issued and share-based compensation (in shares) |  |  | 3 |  |  |  |  |  |  |  |  |  |
Shares issued and share-based compensation | 1,042 |  | $ 1,042 |  |  |  |  |  |  |  |  |  |
Redemption of units for common shares (in shares) |  |  | 33 |  |  |  |  |  |  |  |  |  |
Redemption of Units for common shares | 0 |  | $ 649 |  |  | (649) |  |  |  |  |  |  |
Redemption of units for cash | (498) |  |  |  |  | (498) |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  | (42) |  |  |  |  |  |  |  |  |  |
Shares repurchased | (2,172) |  | $ (2,172) |  |  |  |  |  |  |  |  |  |
Distributions to nonredeemable noncontrolling interests – consolidated real estate entities | (2,432) |  |  |  |  | (2,432) |  |  |  |  |  |  |
Conversion to equity of notes receivable from nonredeemable noncontrolling interests – consolidated real estate entities | (392) |  |  |  |  | (392) |  |  |  |  |  |  |
Acquisition of nonredeemable noncontrolling interests – consolidated real estate entities | (44) |  | $ (175) |  |  | 131 |  |  |  |  |  |  |
Other (in shares) |  |  | (5) |  |  |  |  |  |  |  |  |  |
Other | (207) |  | $ (207) |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ 643,449 | $ 99,456 | $ 899,234 | $ (429,048) | $ (856) | $ 74,663 |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2018 |  |  | 11,942 |  |  |  |  |  |  |  |  |  |

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