Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated Net Income	$ 425,508	$ 401,103
Adjustments to reconcile consolidated net income to net cash provided by operating activities -
Depreciation and amortization	302,667	330,562
Gain upon acquisition of controlling interests and sale or disposal of assets and interests in unconsolidated entities, net		(2,897)
Straight-line rent	(12,827)	(11,779)
Equity in income of unconsolidated entities	(64,872)	(57,423)
Distributions of income from unconsolidated entities	55,253	51,636
Changes in assets and liabilities -
Tenant receivables and accrued revenue, net	69,486	63,058
Deferred costs and other assets	(38,656)	(12,005)
Accounts payable, accrued expenses, intangibles, deferred revenues and other liabilities	(61,762)	(100,804)
Net cash provided by operating activities	674,797	661,451
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions	(682,405)	(85,459)
Funding of loans to related parties		(13,367)
Capital expenditures, net	(229,228)	(207,655)
Cash from acquisitions and cash impact from the consolidation and deconsolidation of properties		5,402
Investments in unconsolidated entities	(23,429)	(45,861)
Purchase of marketable and non-marketable securities	(10,741)	(5,211)
Distributions of capital from unconsolidated entities and other	435,034	124,676
Net cash used in investing activities	(510,769)	(227,475)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from sales of common stock and other, net of transaction costs	(499)	(82)
Purchase of noncontrolling interest in consolidated properties and other		(89,818)
Distributions to noncontrolling interest holders in properties	(2,535)	(12,751)
Contributions from noncontrolling interest holders in properties	196
Preferred distributions of the Operating Partnership	(479)	(479)
Preferred dividends and distributions to stockholders	(436,611)	(389,097)
Distributions to limited partners	(73,538)	(65,705)
Proceeds from issuance of debt, net of transaction costs	1,966,685	1,810,496
Repayments of debt	(1,395,797)	(2,390,035)
Net cash provided by (used in) financing activities	57,422	(1,137,471)
INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS	221,450	(703,495)
CASH AND CASH EQUIVALENTS, beginning of period	612,282	1,716,863
CASH AND CASH EQUIVALENTS, end of period	$ 833,732	$ 1,013,368