CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Real estate:
Buildings and improvements	$ 10,972,973	$ 10,544,110
Development costs and construction in progress	275,233	225,869
Land	1,889,438	1,822,862
Accumulated depreciation and amortization	(2,250,757)	(1,965,592)
Net real estate	10,886,887	10,627,249
Net investment in direct financing leases	7,280,334	7,153,399
Loans receivable, net	906,961	366,001
Investments in and advances to unconsolidated joint ventures	605,448	196,576
Accounts receivable, net of allowance of $3,785 and $1,529, respectively	36,339	27,494
Cash and cash equivalents	183,810	300,556
Restricted cash	48,976	37,229
Intangible assets, net	481,013	489,842
Real estate and intangible assets held for sale, net		9,819
Other assets, net	940,172	867,705
Total assets	21,369,940	20,075,870
LIABILITIES AND EQUITY
Bank line of credit	838,516
Term loan	213,610	226,858
Senior unsecured notes	7,626,194	6,963,375
Mortgage debt	984,431	1,396,485
Other debt	97,022	74,909
Intangible liabilities, net	84,723	98,810
Accounts payable and accrued liabilities	432,934	318,427
Deferred revenue	95,411	65,872
Total liabilities	10,372,841	9,144,736
Commitments and contingencies
Common stock, $1.00 par value: 750,000,000 shares authorized; 459,746,267 and 456,960,648 shares issued and outstanding, respectively	459,746	456,961
Additional paid-in capital	11,431,987	11,334,041
Cumulative dividends in excess of earnings	(1,132,541)	(1,053,215)
Accumulated other comprehensive loss	(23,895)	(14,487)
Total stockholders' equity	10,735,297	10,723,300
Joint venture partners	73,214	23,729
Non-managing member unitholders	188,588	184,105
Total noncontrolling interests	261,802	207,834
Total equity	10,997,099	10,931,134
Total liabilities and equity	$ 21,369,940	$ 20,075,870