Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Net loss	$ (83,396,000)	$ (63,715,000)
Depreciation and amortization	114,327,000	148,256,000
Amortization of mortgage procurement costs	3,893,000	5,267,000
Impairment of real estate	129,829,000	1,175,000
Write-offs of abandoned development projects	283,000	13,553,000
Loss on extinguishment of debt	878,000	4,948,000
Net gain on land held for divestiture activity	0	(12,308,000)
Net loss on disposition of partial interest in development project	19,590,000	0
Net loss on disposition of partial interest in rental properties	467,000	0
Net gain on change in control of interests	(2,759,000)	(2,762,000)
Deferred income tax expense (benefit)	(48,515,000)	12,995,000
Earnings from unconsolidated entities	(61,197,000)	(15,267,000)
Stock-based compensation expense	7,602,000	5,891,000
Amortization and mark-to-market adjustments of derivative instruments	4,450,000	4,130,000
Cash distributions from operations of unconsolidated entities	39,571,000	33,556,000
Non-cash operating expenses and deferred taxes included in discontinued operations	9,883,000	12,906,000
Gain on disposition included in discontinued operations	(28,100,000)	(21,471,000)
Decrease in land inventory	7,268,000	2,218,000
Decrease in notes and accounts receivable	6,176,000	12,209,000
(Increase) decrease in other assets	(3,081,000)	8,891,000
Decrease in accounts payable, accrued expenses and other liabilities	(21,969,000)	(70,023,000)
Net cash provided by operating activities	95,200,000	80,449,000
Cash Flows from Investing Activities
Capital expenditures	(231,810,000)	(240,518,000)
Payment of lease procurement costs	(2,686,000)	(4,797,000)
Increase in notes receivable	(22,203,000)	(15,330,000)
Decrease in restricted cash used for investing purposes	108,212,000	5,615,000
Proceeds from disposition of full or partial interest in rental properties or development project	193,682,000	21,987,000
Contributions to investments in and advances to unconsolidated entities	(89,111,000)	(21,301,000)
Distributions from investments in and advances to unconsolidated entities	57,387,000	36,838,000
Net cash provided by (used in) investing activities	13,471,000	(217,506,000)
Cash Flows from Financing Activities
Proceeds from nonrecourse mortgage debt and notes payable	481,019,000	97,843,000
Principal payments on nonrecourse mortgage debt and notes payable	(691,112,000)	(91,174,000)
Borrowings on revolving credit facility	637,825,000	206,200,000
Payments on revolving credit facility	(329,825,000)	(86,950,000)
Redemption of Senior Notes due 2015	0	(53,253,000)
Make-whole premium and inducements related to exchange of Senior Notes due 2014 for Class A common stock	0	(4,903,000)
Transaction costs related to exchange of Senior Notes due 2014 for Class A common stock	0	(2,300,000)
Payments of deferred financing costs	(6,800,000)	(7,888,000)
Purchase of treasury stock	(3,781,000)	(3,226,000)
Redemption of Series A preferred stock	0	(5,063,000)
Proceeds from equity call hedge related to the issuance of Series A preferred stock	0	10,231,000
Exercise of stock options	267,000	8,027,000
Dividends paid to preferred shareholders	0	(185,000)
Acquisitions of noncontrolling interests	(14,245,000)	(9,041,000)
Contributions from noncontrolling interests	1,839,000	38,194,000
Distributions to noncontrolling interests	(7,140,000)	(7,122,000)
Net cash provided by financing activities	68,047,000	89,390,000
Net increase (decrease) in cash and equivalents	176,718,000	(47,667,000)
Cash and equivalents at beginning of period	280,206,000	293,557,000
Cash and equivalents at end of period	456,924,000	245,890,000
Operating Activities
Decrease in land inventory	1,660,000	13,351,000
Increase in notes and accounts receivable	6,683,000	(30,716,000)
Increase in other assets	(2,999,000)	(34,623,000)
Increase in accounts payable, accrued expenses and other liabilities	4,311,000	15,225,000
Total effect on operating activities	9,655,000	(36,763,000)
Investing Activities
Decrease in projects under construction and development	359,234,000	10,177,000
Decrease (increase) in completed rental properties	123,472,000	(108,206,000)
Increase in restricted cash	(20,000)	0
Increase in notes and accounts receivable	(42,991,000)	0
Increase in investments in and advances to affiliates	(112,531,000)	(12,631,000)
Total effect on investing activities	327,164,000	(110,660,000)
Financing Activities
Increase in accounts payable, accrued expenses and other liabilities	41,828,000	0
(Decrease) increase in nonrecourse mortgage debt and notes payable	(339,309,000)	175,594,000
Decrease in convertible senior debt	0	(178,241,000)
Decrease in preferred stock	0	(5,489,000)
Increase in Class A common stock	225,000	3,551,000
(Decrease) increase in additional paid-in capital	(33,611,000)	137,906,000
Increase in treasury stock	0	(12,868,000)
Increase in redeemable noncontrolling interest	28,390,000	2,237,000
(Decrease) increase in noncontrolling interest	(34,342,000)	24,733,000
Total effect on financing activities	$ (336,819,000)	$ 147,423,000