Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Cash Flows from Operating Activities
Net earnings	$ 23,773,000	$ 47,473,000
Depreciation and amortization	52,833,000	55,853,000
Amortization of mortgage procurement costs	2,869,000	2,882,000
Impairment of real estate	1,381,000	4,835,000
Write-off of abandoned development projects	447,000	157,000
Loss on extinguishment of debt	719,000	296,000
Net gain on disposition of partial interests in rental properties	0	(9,561,000)
Deferred income tax expense	8,444,000	116,000
Equity in earnings of unconsolidated entities	(3,773,000)	(19,994,000)
Stock-based compensation expense	2,528,000	2,811,000
Amortization and mark-to-market adjustments of derivative instruments	(3,133,000)	(153,000)
Non-cash interest expense related to Senior Notes	81,000	557,000
Cash distributions from operations of unconsolidated entities	16,014,000	9,459,000
Cost of sales of land included in projects under construction and development and completed rental properties	2,825,000	1,535,000
Increase in land held for development and sale	(5,337,000)	(9,957,000)
Decrease (increase) in notes and accounts receivable	22,527,000	(10,326,000)
Decrease (increase) in other assets	4,098,000	(9,794,000)
Increase in restricted cash and escrowed funds used for operating purposes	(1,392,000)	(536,000)
Decrease in accounts payable, accrued expenses and other liabilities	(42,338,000)	(14,802,000)
Net cash provided by operating activities	76,706,000	47,446,000
Cash Flows from Investing Activities
Capital expenditures	(196,354,000)	(167,698,000)
Payment of lease procurement costs	(2,049,000)	(2,932,000)
Decrease (increase) in other assets	4,662,000	(13,082,000)
Decrease in restricted cash and escrowed funds used for investing purposes	158,794,000	87,233,000
Proceeds from disposition of full or partial interests in rental properties	8,642,000	193,338,000
(Increase) decrease in investments in and advances to unconsolidated entities	(21,645,000)	7,563,000
Net cash (used in) provided by investing activities	(47,950,000)	104,422,000
Cash Flows from Financing Activities
Proceeds from nonrecourse mortgage debt and notes payable	210,957,000	101,444,000
Principal payments on nonrecourse mortgage debt and notes payable	(157,733,000)	(147,313,000)
Borrowings on bank revolving credit facility	75,000,000	250,075,000
Payments on bank revolving credit facility	(75,000,000)	(305,800,000)
Payment of transaction costs related to exchanges of Convertible Senior Notes due 2016 for Class A common stock		(2,200,000)
Payment of deferred financing costs	(4,132,000)	(8,334,000)
Change in restricted cash and escrowed funds and book overdrafts		(10,590,000)
Purchase of treasury stock	(1,182,000)	(1,339,000)
Exercise of stock options	6,000	169,000
Dividends paid to preferred shareholders	(3,850,000)	(3,850,000)
Contributions from noncontrolling interests	64,000	38,000
Distributions to noncontrolling interests	(2,694,000)	(12,899,000)
Net cash provided by (used in) financing activities	41,436,000	(140,599,000)
Net increase in cash and equivalents	70,192,000	11,269,000
Cash and equivalents at beginning of period	217,486,000	193,372,000
Cash and equivalents at end of period	287,678,000	204,641,000
Operating Activities
Increase in land held for development and sale	(1,350,000)	(5,690,000)
Decrease in notes and accounts receivable	2,535,000	29,345,000
Decrease in other assets	1,869,000	62,234,000
Decrease in restricted cash and escrowed funds	49,000	9,127,000
Increase in accounts payable and accrued expenses	7,533,000	20,645,000
Total effect on operating activities	10,636,000	115,661,000
Investing Activities
Increase in projects under construction and development	(14,713,000)	(14,628,000)
Decrease in completed rental properties	26,995,000	469,948,000
Increase in investments in and advances to affiliates	(809,000)	(42,659,000)
Total effect on investing activities	11,473,000	412,661,000
Financing Activities
Decrease in nonrecourse mortgage debt and notes payable	(22,871,000)	(532,841,000)
(Decrease) increase in additional paid-in capital	(1,116,000)	4,054,000
Increase in redeemable noncontrolling interest	2,980,000	619,000
Decrease in noncontrolling interest	(1,102,000)	(154,000)
Total effect on financing activities	(22,109,000)	(528,322,000)
Segment Discontinued Operations
Cash Flows from Operating Activities
Depreciation and amortization		2,538,000
Amortization of mortgage procurement costs		567,000
Deferred income tax expense	3,019,000	3,921,000
Gain on disposition of rental properties	$ (8,879,000)	$ (10,431,000)