CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Real estate:
Buildings and improvements	$ 9,069,420	$ 8,822,653
Development costs and construction in progress	229,543	190,590
Land	1,724,563	1,723,601
Accumulated depreciation and amortization	(1,662,116)	(1,452,688)
Net real estate	9,361,410	9,284,156
Net investment in direct financing leases	6,843,249	6,727,777
Loans receivable, net	240,929	110,253
Investments in and advances to unconsolidated joint ventures	217,092	224,052
Accounts receivable, net of allowance of $1,498 and $1,341, respectively	31,763	26,681
Cash and cash equivalents	96,476	33,506
Restricted cash	43,428	41,553
Intangible assets, net	382,321	372,390
Assets held for sale, net	91,226	102,649
Other assets, net	771,442	485,458
Total assets	18,079,336	17,408,475
LIABILITIES AND EQUITY
Bank line of credit		454,000
Term loan	221,214
Senior unsecured notes	5,913,690	5,416,063
Mortgage debt	1,684,514	1,715,039
Liabilities related to assets held for sale, net	5,649	55,897
Other debt	84,580	87,985
Intangible liabilities, net	105,191	117,777
Accounts payable and accrued liabilities	270,843	275,478
Deferred revenue	65,802	65,614
Total liabilities	8,351,483	8,187,853
Commitments and contingencies
Preferred stock, $1.00 par value: aggregate liquidation preference of $295.5 million as of December 31, 2011		285,173
Common stock, $1.00 par value: 750,000,000 shares authorized; 429,980,165 and 408,629,444 shares issued and outstanding, respectively	429,980	408,629
Additional paid-in capital	10,185,982	9,383,536
Cumulative dividends in excess of earnings	(1,081,317)	(1,024,274)
Accumulated other comprehensive loss	(16,646)	(19,582)
Total stockholders' equity	9,517,999	9,033,482
Joint venture partners	14,884	16,971
Non-managing member unitholders	194,970	170,169
Total noncontrolling interests	209,854	187,140
Total equity	9,727,853	9,220,622
Total liabilities and equity	$ 18,079,336	$ 17,408,475