Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated Net Income	$ 1,042,765	$ 470,188
Adjustments to reconcile consolidated net income to net cash provided by operating activities -
Depreciation and amortization	620,189	544,415
Gain upon acquisition of controlling interests, sale or disposal of assets and interests in unconsolidated entities, and impairment charge on investment in unconsolidated entities, net	(494,837)	(13,765)
Straight-line rent	(17,211)	(12,129)
Equity in income of unconsolidated entities	(59,484)	(32,441)
Distributions of income from unconsolidated entities	65,307	51,860
Changes in assets and liabilities -
Tenant receivables and accrued revenue, net	80,566	56,674
Deferred costs and other assets	(49,131)	(139,832)
Accounts payable, accrued expenses, intangibles, deferred revenues and other liabilities	11,026	(26,922)
Net cash provided by operating activities	1,199,190	898,048
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions	(3,690,778)	(11,976)
Repayments of loans from related parties	92,600
Capital expenditures, net	(343,830)	(163,463)
Cash impact from the consolidation of properties	91,170
Net proceeds from sale of assets	375,838	136,013
Investments in unconsolidated entities	(117,067)	(6,749)
Purchase of marketable and non-marketable securities	(11,252)	(10,228)
Repayments of loans held for investment	76,768
Distributions of capital from unconsolidated entities and other	140,402	203,314
Net cash (used in) provided by investing activities	(3,386,149)	146,911
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from sales of common stock and other, net of transaction costs	1,213,907	1,826
Distributions to noncontrolling interest holders in properties	(7,602)	(23,846)
Contributions from noncontrolling interest holders in properties	369	52
Preferred distributions of the Operating Partnership	(958)	(958)
Preferred dividends and distributions to stockholders	(584,084)	(470,803)
Distributions to limited partners	(119,014)	(96,540)
Proceeds from issuance of debt, net of transaction costs	4,491,738	205,946
Repayments of debt	(2,967,548)	(667,641)
Net cash provided by (used in) financing activities	2,026,808	(1,051,964)
DECREASE IN CASH AND CASH EQUIVALENTS	(160,151)	(7,005)
CASH AND CASH EQUIVALENTS, beginning of period	798,650	796,718
CASH AND CASH EQUIVALENTS, end of period	$ 638,499	$ 789,713