CONDENSED 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:
Net income	$ 450,509	$ 401,539
Depreciation and amortization of real estate, in-place lease and other intangibles:
Continuing operations	215,314	170,062
Discontinued operations	170	6,138
Amortization of above and below market lease intangibles, net	(6,068)	(1,322)
Amortization of deferred compensation	11,638	11,407
Amortization of deferred financing costs, net	9,440	8,459
Straight-line rents	(15,955)	(21,787)
Loan and direct financing lease interest accretion	(45,539)	(48,159)
Deferred rental revenues	(965)	1,169
Equity income from unconsolidated joint ventures	(30,386)	(29,407)
Distributions of earnings from unconsolidated joint ventures	1,624	1,878
Gain on sales of real estate	(887)	(2,856)
Marketable securities gain on sales, net	(10,977)
Foreign currency and derivative (gains) losses, net	780	(52)
Changes in:
Accounts receivable, net	462	708
Other assets	(12,852)	(8,188)
Accounts payable and accrued liabilities	5,294	(6,038)
Net cash provided by operating activities	571,602	483,551
Cash flows from investing activities:
Acquisitions of real estate	(60,353)	(10,970)
Development of real estate	(67,983)	(51,890)
Leasing costs and tenant and capital improvements	(19,938)	(27,112)
Proceeds from sales of real estate, net	3,777	7,238
Distributions in excess of earnings from unconsolidated joint ventures	904	1,529
Purchases of marketable debt securities	(16,706)	(214,859)
Proceeds from the sale of marketable securities	28,030
Principal repayments on loans receivable	19,112	4,508
Investments in loans receivable	(300,673)	(20,757)
Increase in restricted cash	(7,105)	(1,229)
Net cash used in investing activities	(420,935)	(313,542)
Cash flows from financing activities:
Net borrowings (repayments) under bank line of credit	265,049	(238,985)
Issuance of senior unsecured notes		450,000
Repayments of senior unsecured notes	(150,000)	(250,000)
Repayments of mortgage debt	(40,380)	(42,538)
Deferred financing costs		(10,236)
Preferred stock redemption		(295,500)
Net proceeds from the issuance of common stock and exercise of options	61,860	783,137
Dividends paid on common and preferred stock	(477,453)	(422,852)
Issuance of noncontrolling interests	3,141	873
Distributions to noncontrolling interests	(7,506)	(7,778)
Net cash used in financing activities	(345,289)	(33,879)
Effect of foreign exchange on cash and cash equivalents	63
Net increase (decrease) in cash and cash equivalents	(194,559)	136,130
Cash and cash equivalents, beginning of period	247,673	33,506
Cash and cash equivalents, end of period	$ 53,114	$ 169,636