Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net earnings (loss)	$ 246,072,000	$ (83,396,000)
Depreciation and amortization	126,816,000	114,327,000
Amortization of mortgage procurement costs	3,963,000	3,893,000
Impairment of real estate	0	129,829,000
Write-offs of abandoned development projects	5,778,000	283,000
Loss on extinguishment of debt	38,344,000	878,000
Net loss on disposition of partial interest in development project	0	19,590,000
Net loss on disposition of partial interest in rental properties	0	467,000
Net gain on change in control of interests	(487,684,000)	(2,759,000)
Deferred income tax expense (benefit)	179,521,000	(48,515,000)
Total Equity in Earnings on Unconsolidated Entities	(28,322,000)	(61,197,000)
Stock-based compensation expense	11,242,000	7,602,000
Amortization and mark-to-market adjustments of derivative instruments	(4,547,000)	4,450,000
Cash distributions from operations of unconsolidated entities	30,483,000	39,571,000
Non-cash operating expenses and deferred taxes included in discontinued operations	0	9,883,000
Gain on disposition of rental properties included in discontinued operations	0	(28,100,000)
Decrease in land inventory	2,575,000	7,268,000
(Increase) decrease in notes and accounts receivable	(8,746,000)	6,176,000
Increase in other assets	(7,405,000)	(3,081,000)
Decrease in accounts payable, accrued expenses and other liabilities	(19,697,000)	(21,969,000)
Net cash provided by operating activities	88,393,000	95,200,000
Cash Flows from Investing Activities
Capital expenditures	(191,952,000)	(211,822,000)
Acquisitions	(397,275,000)	(19,988,000)
Payment of lease procurement costs	(5,624,000)	(2,686,000)
Increase in notes receivable	(18,113,000)	(22,203,000)
Decrease in restricted cash used for investing purposes	38,934,000	108,212,000
Proceeds from disposition of rental properties	1,650,000	193,682,000
Contributions to investments in and advances to unconsolidated entities	(56,306,000)	(87,635,000)
Distributions from investments in and advances to unconsolidated entities	4,000,000	55,911,000
Net cash (used in) provided by investing activities	(624,686,000)	13,471,000
Cash Flows from Financing Activities
Proceeds from nonrecourse mortgage debt and notes payable	142,201,000	481,019,000
Principal payments on nonrecourse mortgage debt and notes payable	(394,531,000)	(691,112,000)
Borrowings on revolving credit facility	111,850,000	637,825,000
Payments on revolving credit facility	(111,850,000)	(329,825,000)
Payments to noteholders related to exchange of convertible senior notes	(37,752,000)	0
Transaction costs related to exchange of convertible senior notes	(4,675,000)	0
Proceeds received from termination of convertible senior note hedge	17,818,000	0
Proceeds from issuance of Class A common stock, net of $34,438 of transaction costs	806,500,000	0
Payments of deferred financing costs	(10,108,000)	(6,800,000)
Purchase of treasury stock	(5,412,000)	(3,781,000)
Exercise of stock options	445,000	267,000
Acquisitions of noncontrolling interests	(308,000)	(14,245,000)
Contributions from noncontrolling interests	42,683,000	1,839,000
Distributions to noncontrolling interests	(12,236,000)	(7,140,000)
Net cash provided by financing activities	544,625,000	68,047,000
Net increase in cash and equivalents	8,332,000	176,718,000
Cash and equivalents at beginning of period	326,518,000	280,206,000
Cash and equivalents at end of period	$ 334,850,000	$ 456,924,000