Real Estate Investment in Real Estate - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 27, 2013
Land	$ 5,864,046	$ 6,295,404
Depreciable property [Abstract]
Buildings and improvements	16,336,829	17,974,337
Furniture, fixtures and equipment	1,207,098	1,365,276
Finite-Lived Intangible Asset, Acquired-in-Place Leases	483,160	511,891
Projects under development [Abstract]
Construction-in-progress	1,122,376	1,343,919
Land held for development [Abstract]
Land held for development	168,843	184,556
Construction-in-progress	1,122,376	1,343,919
Investment in real estate	25,182,352	27,675,383
Accumulated depreciation	(4,905,406)	(5,432,805)
Investment in real estate, net	20,276,946	22,242,578
Amortization of above/below market leases	3,382	3,222	$ 898
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	3,425
Finite-Lived Intangible Assets, Amortization Expense, Year Two	3,781
Finite-Lived Intangible Assets, Amortization Expense, Year Three	4,250
Finite-Lived Intangible Assets, Amortization Expense, Year Four	4,250
Finite-Lived Intangible Assets, Amortization Expense, Year Five	4,250
Assets [Member]
Land held for development [Abstract]
Below Market Lease, Gross	178,251	178,251		$ 178,251
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross	1,260	1,260
Lease intangible assets	179,511	179,511
Finite-Lived Intangible Assets, Accumulated Amortization	(13,451)	(8,913)
Finite-Lived Intangible Assets, Net	166,060	170,598
Liability [Member]
Land held for development [Abstract]
Below Market Lease, Gross	5,270	5,270		$ 8,040
Off-market Lease, Unfavorable	2,400	2,400
Lease Intangible Liabilities	7,670	7,670
Finite Lived Intangible Liabilities Accumulated Amortization	(3,414)	(2,258)
Lease Intangible Liabilities, net	4,256	5,412
Ground Lease [Member]
Land held for development [Abstract]
Amortization of above/below market leases	4,300	4,300	3,600
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	4,321
Finite-Lived Intangible Assets, Amortization Expense, Year Two	4,321
Finite-Lived Intangible Assets, Amortization Expense, Year Three	4,321
Finite-Lived Intangible Assets, Amortization Expense, Year Four	4,321
Finite-Lived Intangible Assets, Amortization Expense, Year Five	4,321
Retail Site [Member]
Land held for development [Abstract]
Amortization of above/below market leases	900	1,100	$ 2,700
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	(896)
Finite-Lived Intangible Assets, Amortization Expense, Year Two	(540)
Finite-Lived Intangible Assets, Amortization Expense, Year Three	(71)
Finite-Lived Intangible Assets, Amortization Expense, Year Four	(71)
Finite-Lived Intangible Assets, Amortization Expense, Year Five	(71)
Projects under development [Member]
Projects under development [Abstract]
Land Under Development	284,995	466,764
Construction-in-progress	837,381	877,155
Land held for development [Abstract]
Construction-in-progress	837,381	877,155
Land held for development [Member]
Projects under development [Abstract]
Construction-in-progress	48,836	39,190
Land held for development [Abstract]
Land held for development	120,007	145,366
Construction-in-progress	$ 48,836	$ 39,190