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	$ 346,230	$ 275,649
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including amounts in discontinued operations)	569,325	563,027
Amortization of deferred revenue and lease intangibles, net	(11,159)	(12,965)
Other non-cash amortization	(13,376)	(31,326)
Stock-based compensation	15,010	16,529
Straight-lining of rental income, net	(21,165)	(16,712)
(Gain) loss on extinguishment of debt, net	(1,062)	38,339
Gain on real estate dispositions, net (including amounts in discontinued operations)	(2,241)	(79,148)
(Gain) loss on real estate loan investments	(3,598)	559
Gain on sale of marketable debt securities	(856)	0
Income tax benefit (including amounts in discontinued operations)	(13,100)	(2,731)
Loss (income) from unconsolidated entities	707	(1,260)
Gain on re-measurement of equity interest upon acquisition, net	(1,241)	(16,645)
Other	6,133	6,472
Changes in operating assets and liabilities:
Increase in other assets	(28,132)	(11,930)
Increase in accrued interest	14,624	18,730
Decrease in accounts payable and other liabilities	(20,670)	(37,269)
Net cash provided by operating activities	835,429	709,319
Cash flows from investing activities:
Net investment in real estate property	(1,358,766)	(1,154,912)
Purchase of noncontrolling interest	(7,895)	(3,934)
Investment in loans receivable and other	(34,717)	(30,523)
Proceeds from real estate disposals	29,191	75,145
Proceeds from loans receivable	299,156	34,817
Proceeds from Sale and Maturity of Marketable Securities	5,493	0
Funds held in escrow for future development expenditures	15,189	0
Development project expenditures	(74,707)	(90,119)
Capital expenditures	(50,634)	(42,270)
Other	(411)	(2,110)
Net cash used in investing activities	(1,178,101)	(1,213,906)
Cash flows from financing activities:
Net change in borrowings under revolving credit facility	(92,586)	248,921
Proceeds from debt	1,766,844	1,568,382
Repayment of debt	(840,532)	(1,103,000)
Payment of deferred financing costs	(19,977)	(4,257)
Issuance of common stock, net	106,002	342,469
Cash distribution to common stockholders	(588,770)	(545,240)
Cash distribution to redeemable OP unitholders	(3,479)	(3,358)
Contributions from Noncontrolling Interests	2,094	0
Purchases of redeemable OP units	(317)	(1,760)
Distributions to noncontrolling interest	(7,614)	(4,035)
Other	7,830	19,130
Net cash provided by financing activities	329,495	517,252
Net (decrease) increase in cash and cash equivalents	(13,177)	12,665
Effect of foreign currency translation on cash and cash equivalents	(59)	58
Cash and cash equivalents at beginning of period	67,908	45,807
Cash and cash equivalents at end of period	54,672
Assets and liabilities assumed from acquisitions:
Real estate investments	221,447	497,755
Utilization of funds held for an Internal Revenue Code Section 1031 exchange	0	(134,003)
Other assets acquired	6,526	99,889
Debt assumed	183,848	367,902
Other liabilities	27,583	60,684
Deferred income tax liability	4,849	4,299
Noncontrolling interests	11,693	26,430
Equity issued	0	4,326
Debt transferred on the sale of assets	$ 0	$ 14,535