CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 687,367	$ 600,582
Depreciation and amortization of real estate, in-place lease and other intangibles:
Continuing operations	317,430	254,463
Discontinued operations	4,346	11,876
Amortization of above and below market lease intangibles, net	(6,414)	(1,855)
Amortization of deferred compensation	33,833	16,947
Amortization of deferred financing costs, net	13,922	12,415
Straight-line rents	(28,559)	(33,608)
Loan and direct financing lease interest accretion	(65,296)	(71,923)
Deferred rental revenues	73	1,101
Equity income from unconsolidated joint ventures	(44,278)	(42,803)
Distributions of earnings from unconsolidated joint ventures	2,724	2,775
Gain on sales of real estate	(9,185)	(2,856)
Gain on sales of marketable securities, net	(11,350)
Foreign currency and derivative losses, net	386	43
Impairments		7,878
Changes in:
Accounts receivable, net	6,389	(5,082)
Other assets	(43,939)	(7,303)
Accounts payable and accrued liabilities	(13,769)	(21,697)
Net cash provided by operating activities	843,680	720,953
Cash flows from investing activities:
Acquisitions of real estate	(63,878)	(172,380)
Development of real estate	(96,914)	(87,119)
Leasing costs and tenant and capital improvements	(33,964)	(42,817)
Proceeds from sales of real estate, net	3,777	7,238
Distributions in excess of earnings from unconsolidated joint ventures	1,194	2,051
Purchases of marketable debt securities	(16,706)	(214,859)
Proceeds from the sale of marketable securities	28,403
Principal repayments on loans receivable	231,004	4,660
Investments in loans receivable	(316,494)	(145,597)
Increase in restricted cash	(10,376)	(1,875)
Net cash used in investing activities	(273,954)	(650,698)
Cash flows from financing activities:
Net borrowings (repayments) under bank line of credit	283,082	(454,000)
Borrowings under term loan		214,789
Issuance of senior unsecured notes		750,000
Repayments of senior unsecured notes	(150,000)	(250,000)
Repayments of mortgage debt	(285,005)	(109,569)
Issuance of mortgage and other debt	6,798
Deferred financing costs		(18,256)
Preferred stock redemption		(295,500)
Net proceeds from the issuance of common stock and exercise of options	92,504	804,412
Dividends paid on common and preferred stock	(716,869)	(638,228)
Issuance of noncontrolling interests	12,387	826
Distributions to noncontrolling interests	(11,536)	(11,759)
Net cash used in financing activities	(768,639)	(7,285)
Effect of foreign exchange on cash and cash equivalents	654
Net increase (decrease) in cash and cash equivalents	(198,259)	62,970
Cash and cash equivalents, beginning of period	247,673	33,506
Cash and cash equivalents, end of period	$ 49,414	$ 96,476