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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Apr. 30, 2015 | Apr. 30, 2014
--- | --- | ---
Other assets |  |
Intangible assets, accumulated amortization | $ 26,576 | $ 24,071
Property and equipment, accumulated depreciation | 1,464 | 2,041
Deferred charges and leasing costs, accumulated amortization | $ 21,340 | $ 21,068
EQUITY |  |
Common Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 | $ 0
Common Shares of Beneficial Interest, shares issued (in shares) | 124,455,624 | 109,019,341
Common Shares of Beneficial Interest, shares outstanding (in shares) | 124,455,624 | 109,019,341
Noncontrolling interests - Operating Partnership (in shares) | 13,999,725 | 21,093,445
Receivable Arising from Straight-Lining of Rents [Member] |  |
Other assets |  |
Allowance for doubtful accounts receivable | $ 718 | $ 796
Accounts Receivable [Member] |  |
Other assets |  |
Allowance for doubtful accounts receivable | $ 438 | $ 248
Preferred Class A [Member] |  |
EQUITY |  |
Preferred Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 | $ 0
Preferred Shares of Beneficial Interest, shares issued (in shares) | 1,150,000 | 1,150,000
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 1,150,000 | 1,150,000
Preferred Shares of Beneficial Interest, aggregate liquidation preference | $ 28,750,000 | $ 28,750,000
Preferred Class B [Member] |  |
EQUITY |  |
Preferred Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 | $ 0
Preferred Shares of Beneficial Interest, shares issued (in shares) | 4,600,000 | 4,600,000
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 4,600,000 | 4,600,000
Preferred Shares of Beneficial Interest, aggregate liquidation preference | $ 115,000,000 | $ 115,000,000

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