CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Company's involvement with VIEs:
Development costs	$ 430,104	$ 388,576
Land	1,956,841	1,948,757
Accumulated depreciation and amortization	2,636,636	2,541,334
Investments in unconsolidated joint ventures	608,665	605,244
Accounts Receivable	45,224	48,929
Cash	94,665	346,500
Restricted cash	46,280	60,616
Intangible assets, net	585,330	603,706
Other assets, net	817,279	802,273
Mortgage debt	895,289	932,212
Intangible liabilities, net	52,794	56,147
Accounts payable and accrued liabilities	433,144	436,239
Deferred Revenue	129,656	123,017
Balance Sheet Parenthetical Disclosures
Accounts receivable, allowance (in dollars)	$ 4,161	$ 3,261
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	466,924,935	465,488,492
Common stock, shares outstanding	466,924,935	465,488,492
VIEs
Company's involvement with VIEs:
Buildings and improvements	$ 3,400,000	$ 3,400,000
Development costs	60,000	54,000
Land	327,000	327,000
Accumulated depreciation and amortization	567,000	537,000
Investments in unconsolidated joint ventures	14,000	14,000
Accounts Receivable	18,000	19,000
Cash	60,000	61,000
Restricted cash	23,000	21,000
Intangible assets, net	197,000	204,000
Other assets, net	66,000	63,000
Mortgage debt	573,000	589,000
Intangible liabilities, net	10,000	10,000
Accounts payable and accrued liabilities	107,000	107,000
Deferred Revenue	$ 23,000	$ 19,000