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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
REVENUE | $ 169,745 | $ 160,104 | $ 145,500
EXPENSES |  |  |
Property operating expenses, excluding real estate taxes | 54,292 | 47,587 | 43,741
Real estate taxes | 18,742 | 16,739 | 14,407
Casualty loss | 500 | 414 | 238
Depreciation and amortization | 82,070 | 44,253 | 39,273
Impairment of real estate investments | 18,065 | 57,028 | 5,543
General and administrative expenses | 14,203 | 15,871 | 13,498
Acquisition and investment related costs | 51 | 3,276 | 830
TOTAL EXPENSES | 193,449 | 190,214 | 121,244
Operating income (loss) | (23,704) | (30,110) | 24,256
Interest expense | (34,178) | (34,314) | (28,417)
Loss on extinguishment of debt | (940) | (1,651) | (106)
Interest income | 1,197 | 366 | 78
Other income | 311 | 780 | 307
Loss before gain on sale of real estate and other investments, gain on bargain purchase and income from discontinued operations | (57,314) | (64,929) | (3,882)
Gain on sale of real estate and other investments | 20,120 | 18,701 | 9,640
Gain on bargain purchase | 0 | 0 | 3,424
Income (loss) from continuing operations | (37,194) | (46,228) | 9,182
Income from discontinued operations | 164,823 | 76,753 | 67,420
NET INCOME | 127,629 | 30,525 | 76,602
Net income attributable to noncontrolling interests – Operating Partnership | (12,702) | (4,059) | (7,032)
Net loss attributable to noncontrolling interests – consolidated real estate entities | 1,861 | 16,881 | 2,436
Net income attributable to Investors Real Estate Trust | 116,788 | 43,347 | 72,006
Dividends to preferred shareholders | (8,569) | (10,546) | (11,514)
Redemption of preferred shares | (3,657) | (1,435) | 0
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS | $ 104,562 | $ 31,366 | $ 60,492
Earnings (loss) per common share from continuing operations – Investors Real Estate Trust – basic and diluted (in dollars per share) | $ (0.36) | $ (0.30) | $ 0.00
Earnings per common share from discontinued operations – Investors Real Estate Trust – basic and diluted (in dollars per share) | 1.23 | 0.56 | 0.49
NET INCOME PER COMMON SHARE – BASIC & DILUTED (in dollars per share) | $ 0.87 | $ 0.26 | $ 0.49
Management Service [Member] |  |  |
Cost of revenue | $ 5,526 | $ 5,046 | $ 3,714

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