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	$ 227,631	$ 163,828
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including amounts in discontinued operations)	380,932	366,405
Amortization of deferred revenue and lease intangibles, net	(7,003)	(8,829)
Other non-cash amortization	(9,401)	(21,185)
Stock-based compensation	10,800	11,086
Straight-lining of rental income, net	(14,330)	(10,470)
(Gain) loss on extinguishment of debt, net	(873)	39,533
Gain on real estate dispositions, net (including amounts in discontinued operations)	(2,195)	(78,791)
(Gain) loss on real estate loan investments	(1,099)	559
Gain on sale of marketable debt securities	(856)	0
Income tax (benefit) expense (including amounts in discontinued operations)	(10,320)	6,138
Loss (income) from unconsolidated entities	818	(831)
Gain on re-measurement of equity interest upon acquisition, net	(1,241)	0
Other	3,872	5,990
Changes in operating assets and liabilities:
(Increase) decrease in other assets	(16,415)	861
Increase in accrued interest	3,315	10,259
Decrease in accounts payable and other liabilities	(55,947)	(23,745)
Net cash provided by operating activities	507,688	460,808
Cash flows from investing activities:
Net investment in real estate property	(283,622)	(899,404)
Purchase of noncontrolling interest	(6,124)	(3,934)
Investment in loans receivable and other	(32,332)	(27,260)
Proceeds from real estate disposals	24,290	8,847
Proceeds from loans receivable	218,043	33,223
Proceeds from Sale and Maturity of Marketable Securities	5,493	0
Funds held in escrow for future development expenditures	11,816	0
Development project expenditures	(48,284)	(60,561)
Capital expenditures	(32,459)	(23,812)
Other	(411)	(2,150)
Net cash used in investing activities	(143,590)	(975,051)
Cash flows from financing activities:
Net change in borrowings under revolving credit facility	(280,926)	(88,654)
Proceeds from debt	918,455	1,269,315
Repayment of debt	(685,518)	(645,722)
Payment of deferred financing costs	(12,997)	(2,980)
Issuance of common stock, net	82,384	342,469
Cash distribution to common stockholders	(392,230)	(361,957)
Cash distribution to redeemable OP unitholders	(2,313)	(2,241)
Contributions from Noncontrolling Interests	2,094	0
Purchases of redeemable OP units	(208)	(611)
Distributions to noncontrolling interest	(5,045)	(2,907)
Other	6,808	14,509
Net cash (used in) provided by financing activities	(369,496)	521,221
Net (decrease) increase in cash and cash equivalents	(5,398)	6,978
Effect of foreign currency translation on cash and cash equivalents	(89)	18
Cash and cash equivalents at beginning of period	67,908	45,807
Cash and cash equivalents at end of period	62,421	52,803
Assets and liabilities assumed from acquisitions:
Real estate investments	90,020	364,883
Utilization of funds held for an Internal Revenue Code Section 1031 exchange	0	(134,003)
Other assets acquired	2,562	81,509
Debt assumed	68,602	250,363
Other liabilities	10,493	26,639
Deferred income tax liability	1,794	5,895
Noncontrolling interests	11,693	25,166
Equity issued	0	4,326
Debt transferred on the sale of assets	$ 0	$ 14,535