CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 18,159	$ 5,585
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	50,475	46,328
Gain on sale of real estate, land, other investments and discontinued operations	(3,452)	(589)
Gain on involuntary conversion	(2,263)	0
Impairment of real estate investments	0	135
Bad debt expense	893	771
Changes in other assets and liabilities:
Increase in receivable arising from straight-lining of rents	(2,319)	(3,370)
Decrease in accounts receivable	1,969	946
Increase in prepaid and other assets	(1,846)	(1,756)
Increase in tax, insurance and other escrow	(1,189)	(901)
Increase in deferred charges and leasing costs	(4,705)	(5,480)
(Decrease) increase in accounts payable, accrued expenses, and other liabilities	(478)	2,759
Net cash provided by operating activities	55,244	44,428
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from real estate deposits	1,193	1,640
Payments for real estate deposits	(1,095)	(1,889)
Principal proceeds on mortgage loans receivable	0	159
Increase in other investments	0	(8)
Decrease in lender holdbacks for improvements	1,514	5,056
Increase in lender holdbacks for improvements	(1,962)	(315)
Proceeds from sale of discontinued operations	3,909	2,088
Proceeds from sale of real estate and other investments	45	438
Insurance proceeds received	3,455	5,644
Payments for acquisitions and improvements of real estate assets	(103,002)	(101,791)
Net cash used by investing activities	(95,943)	(88,978)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from mortgages payable	57,030	84,195
Principal payments on mortgages payable	(84,359)	(53,661)
Proceeds from revolving line of credit and other debt	26,854	24,227
Principal payments on revolving line of credit and other debt	(34,550)	(60)
Proceeds from sale of common shares, net of issue costs	2,448	2,970
Proceeds from sale of common shares under distribution reinvestment and share purchase program	24,300	20,778
Proceeds from underwritten Public Offering of Preferred Shares - Series B, net of offering costs	111,357	0
Repurchase of fractional shares and partnership units	(15)	(13)
Payments for acquisition of noncontrolling interests - consolidated real estate entities	0	(1,289)
Distributions paid to common shareholders, net of reinvestment of $9,307 and $7,548, respectively	(26,626)	(27,885)
Distributions paid to preferred shareholders	(5,588)	(1,779)
Distributions paid to noncontrolling interests - Unitholders of the Operating Partnership, net of reinvestment of $465 and $504, respectively	(7,728)	(8,009)
Distributions paid to noncontrolling interests - consolidated real estate entities	(111)	(586)
Distributions paid to redeemable noncontrolling interests - consolidated real estate entities	0	(27)
Net cash provided by financing activities	63,012	38,861
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	22,313	(5,689)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	39,989	41,191
CASH AND CASH EQUIVALENTS AT END OF PERIOD	62,302	35,502
SUPPLEMENTARY SCHEDULE OF NON-CASH INVESTING AND FINANCING
Distribution reinvestment plan	9,307	7,548
Operating partnership distribution reinvestment plan	465	504
Operating partnership units converted to shares	846	3,454
Shares issued under the Incentive Award Plan	398	443
Real estate assets acquired through the issuance of operating partnership units	10,116	2,469
Real estate assets acquired through assumption of indebtedness and accrued costs	12,500	7,190
Mortgages included in real estate dispositions	5,887	0
Adjustments to accounts payable included within real estate investments	(2,868)	(3,244)
Land contributed by noncontrolling interests - consolidated real estate entities	7,068	2,227
Fair value adjustments to redeemable noncontrolling interests	0	35
Involuntary conversion of assets due to flood and fire damage	107	2,638
Construction debt reclassified to mortgages payable	13,650	7,190
Cash paid during the year for:
Interest on mortgages	46,276	45,321
Interest other	1,020	2,098
Cash paid during the period, total	$ 47,296	$ 47,419