Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated Net Income	$ 734,993	$ 1,042,765
Adjustments to reconcile consolidated net income to net cash provided by operating activities -
Depreciation and amortization	653,354	620,189
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	(88,835)	(494,837)
Straight-line rent	(21,595)	(17,211)
Equity in income of unconsolidated entities	(110,747)	(59,484)
Distributions of income from unconsolidated entities	104,499	65,307
Changes in assets and liabilities -
Tenant receivables and accrued revenue, net	50,249	80,566
Deferred costs and other assets	(11,536)	(49,131)
Accounts payable, accrued expenses, intangibles, deferred revenues and other liabilities	(77,433)	11,026
Net cash provided by operating activities	1,232,949	1,199,190
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions	(246,574)	(3,690,778)
Funding of loans to related parties	(37,773)
Repayments of loans to related parties		92,600
Capital expenditures, net	(394,290)	(343,830)
Cash from acquisitions and cash impact from the consolidation and deconsolidation of properties		91,170
Net proceeds from sale of assets	183,026	375,838
Investments in unconsolidated entities	(37,413)	(117,067)
Purchase of marketable and non-marketable securities	(19,850)	(11,252)
Proceeds from sale of marketable and non-marketable securities	47,495
Repayments of loans held for investment		76,768
Distributions of capital from unconsolidated entities and other	387,668	140,402
Net cash used in investing activities	(117,711)	(3,386,149)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from sales of common stock and other, net of transaction costs	216	1,213,907
Distributions to noncontrolling interest holders in properties	(4,939)	(7,602)
Contributions from noncontrolling interest holders in properties	218	369
Preferred distributions of the Operating Partnership	(957)	(958)
Preferred dividends and distributions to stockholders	(715,061)	(584,084)
Distributions to limited partners	(119,729)	(119,014)
Proceeds from issuance of debt, net of transaction costs	896,457	4,491,738
Repayments of debt	(1,260,132)	(2,967,548)
Net cash (used in) provided by financing activities	(1,203,927)	2,026,808
DECREASE IN CASH AND CASH EQUIVALENTS	(88,689)	(160,151)
CASH AND CASH EQUIVALENTS, beginning of period	1,184,518	798,650
CASH AND CASH EQUIVALENTS, end of period	$ 1,095,829	$ 638,499