CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Company's involvement with VIEs:
Development costs	$ 387,560	$ 388,576
Land	1,933,823	1,948,757
Accumulated depreciation and amortization	2,716,880	2,541,334
Investments in unconsolidated joint ventures	604,941	605,244
Accounts Receivable	51,800	48,929
Cash	116,450	346,500
Restricted cash	180,404	60,616
Intangible assets, net	550,569	603,706
Other assets, net	791,431	802,273
Mortgage debt	688,910	932,212
Intangible liabilities, net	49,448	56,147
Accounts payable and accrued liabilities	482,133	436,239
Deferred Revenue	136,038	123,017
Balance Sheet Parenthetical Disclosures
Accounts receivable, allowance (in dollars)	$ 4,892	$ 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	467,324,914	465,488,492
Common stock, shares outstanding	467,324,914	465,488,492
VIEs
Company's involvement with VIEs:
Buildings and improvements	$ 3,400,000	$ 3,400,000
Development costs	16,000	54,000
Land	324,000	327,000
Accumulated depreciation and amortization	598,000	537,000
Investments in unconsolidated joint ventures	14,000	14,000
Accounts Receivable	25,000	19,000
Cash	59,000	61,000
Restricted cash	25,000	21,000
Intangible assets, net	184,000	204,000
Other assets, net	62,000	63,000
Mortgage debt	571,000	589,000
Intangible liabilities, net	10,000	10,000
Accounts payable and accrued liabilities	116,000	107,000
Deferred Revenue	$ 25,000	$ 19,000