CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Company's involvement with VIEs:
Development in process	$ 430,007	$ 400,619
Land	1,772,174	1,881,487
Investments in and advances to unconsolidated joint ventures	827,202	571,491
Accumulated depreciation and amortization	2,577,248	2,648,930
Accounts receivable	31,500	45,116
Cash	764,114	94,730
Restricted cash	60,806	42,260
Intangible assets, net	432,109	479,805
Other assets, net	605,407	711,624
Mortgage debt	147,329	623,792
Intangible liabilities, net	54,472	58,145
Accounts payable and accrued liabilities	344,908	417,360
Deferred Revenue	141,561	149,181
Balance Sheet Parenthetical Disclosures
Accounts receivable, allowance (in dollars)	$ 3,941	$ 4,459
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	468,446,208	468,081,489
Common stock, shares outstanding	468,446,208	468,081,489
VIEs
Company's involvement with VIEs:
Buildings and improvements	$ 2,787,845	$ 3,522,310
Development in process	23,837	31,953
Land	214,963	327,241
Investments in and advances to unconsolidated joint ventures	3,108	3,641
Accumulated depreciation and amortization	535,012	676,276
Accounts receivable	9,609	19,996
Cash	37,005	35,844
Restricted cash	42,009	22,624
Intangible assets, net	139,281	169,027
Other assets, net	55,049	69,562
Mortgage debt	45,245	520,870
Intangible liabilities, net	8,734	8,994
Deferred Revenue	$ 16,077	$ 23,456