CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Real Estate:
Buildings and improvements	$ 11,114,139,000	$ 11,692,654,000
Development costs and construction in progress	444,528,000	400,619,000
Land	1,765,305,000	1,881,487,000
Accumulated depreciation and amortization	(2,672,489,000)	(2,648,930,000)
Net real estate	10,651,483,000	11,325,830,000
Net investment in direct financing leases	711,777,000	752,589,000
Loans receivable, net	393,575,000	807,954,000
Investments in and advances to unconsolidated joint ventures	829,231,000	571,491,000
Accounts receivable, net of allowance of $4,104 and $4,459, respectively	36,969,000	45,116,000
Cash and cash equivalents	391,965,000	94,730,000
Restricted cash	61,481,000	42,260,000
Intangible assets, net	414,404,000	479,805,000
Assets held for sale, net	0	927,866,000
Other assets, net	611,690,000	711,624,000
Total assets	14,102,575,000	15,759,265,000
LIABILITIES AND EQUITY
Bank line of credit	136,311,000	899,718,000
Term loans	218,832,000	440,062,000
Senior unsecured notes	6,889,045,000	7,133,538,000
Mortgage debt	146,337,000	623,792,000
Other debt	94,801,000	92,385,000
Intangible liabilities, net	51,463,000	58,145,000
Liabilities of assets held for sale, net	0	3,776,000
Accounts payable and accrued liabilities	389,690,000	417,360,000
Deferred revenue	147,155,000	149,181,000
Total liabilities	8,073,634,000	9,817,957,000
Commitments and contingencies
Common stock, $1.00 par value: 750,000,000 shares authorized; 468,879,344 and 468,081,489 shares issued and outstanding, respectively	468,879,000	468,081,000
Additional paid-in capital	8,216,781,000	8,198,890,000
Cumulative dividends in excess of earnings	(2,956,324,000)	(3,089,734,000)
Accumulated other comprehensive loss	(27,289,000)	(29,642,000)
Total stockholders' equity	5,702,047,000	5,547,595,000
Joint venture partners	149,456,000	214,377,000
Non-managing member unitholders	177,438,000	179,336,000
Total noncontrolling interests	326,894,000	393,713,000
Total equity	6,028,941,000	5,941,308,000
Total liabilities and equity	$ 14,102,575,000	$ 15,759,265,000