Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Operating activities
Net income	$ 71,799		$ 57,458
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	187,122		127,422
Other amortization expenses	4,194		4,984
Provision for loan losses	0		0
Impairment of assets	0		0
Stock-based compensation expense	10,508		11,323
Loss (gain) on derivatives, net	(2,309)		(555)
Loss (gain) on extinguishment of debt, net	(308)		0
Income from unconsolidated entities	(2,262)		(1,532)
Rental income in excess of cash received	(2,538)		(10,125)
Amortization related to above (below) market leases, net	172		(252)
Loss (gain) on sales of properties, net	(82,492)		(769)
Distributions by unconsolidated entities	0		4,009
Increase (decrease) in accrued expenses and other liabilities	18,276		(6,156)
Decrease (increase) in receivables and other assets	(6,972)		(12,873)
Net cash provided from (used in) operating activities	199,808		174,044
Investing activities
Investment in real property, net of cash acquired	(1,850,578)		(570,200)
Capitalized interest	(1,606)		(2,420)
Investment in real estate loans receivable	(11,971)		(10,661)
Other investments, net of payments	(1,978)		22,438
Principal collected on real estate loans receivable	49,926		4,301
Contributions to unconsolidated entities	(359,575)		0
Distributions by unconsolidated entities	9,916		0
Proceeds from (payments on) derivatives	(2,604)		0
Decrease (increase) in restricted cash	(94,840)		(13,879)
Proceeds from sales of real property	294,607		32,584
Net cash provided from (used in) investing activities	(1,968,703)		(537,837)
Financing activities
Net increase (decrease) under unsecured lines of credit arrangements	710,000		(605,000)
Proceeds from issuance of senior unsecured notes	497,862		0
Payments to extinguish senior unsecured notes	0		(22)
Secured debt issued	0		111,000
Payments on secured debt	(18,931)		(41,592)
Net proceeds from the issuance of common stock	45,377		1,087,777
Net proceeds from the issuance of preferred stock	0		277,901
Redemption of preferred stock	0		0
Decrease (increase) in deferred loan expenses	(9,650)		(2,324)
Contributions by noncontrolling interests	1,420	[1]	8,367	[1]
Distributions to noncontrolling interests	(4,522)	[1]	(3,477)	[1]
Cash distributions to stockholders	(216,148)		(162,126)
Other financing activities	(992)		(976)
Net cash provided from (used in) financing activities	1,004,416		669,528
Effect of foreign currency translation on cash and cash equivalents	557		0
Increase (decrease) in cash and cash equivalents	(763,922)		305,735
Cash and cash equivalents at beginning of period	1,033,764		163,482
Cash and cash equivalents at end of period	269,842		469,217
Supplemental cash flow information:
Interest paid	99,202		96,426
Income taxes paid	$ 920		$ 2,596

[1] Includes amounts attributable to redeemable noncontrolling interests.