Summary of Significant Accounting Policies (Details 7) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets
Unamortized below market leases included in accounts payable, accrued expenses, intangibles and deferred revenues	$ 145,500,000	$ 199,200,000
Estimated future amortization, and the increasing (decreasing) effect on below market minimum rents
2014	35,128,000
2015	30,552,000
2016	25,499,000
2017	17,995,000
2018	13,931,000
Thereafter	22,413,000
Lease intangibles assets, net	145,518,000
Estimated future amortization, and the increasing (decreasing) effect on minimum rents
2014	13,108,000
2015	11,111,000
2016	8,031,000
2017	4,106,000
2018	2,869,000
Thereafter	7,570,000
Lease intangibles assets, net	46,795,000
In-place lease intangibles
Intangible Assets
Average life of in-place lease intangibles	3 years 9 months 18 days
Lease intangibles assets, gross	481,661,000	480,517,000
Accumulated amortization	(191,097,000)	(122,376,000)
Lease intangibles assets, net	290,564,000	358,141,000
Above and below market leases
Intangible Assets
Weighted average remaining life of intangible	5 years
Amount of amortization expenses	24,100,000	16,500,000	17,600,000
Above Market Leases
Intangible Assets
Lease intangibles assets, gross	249,115,000	248,357,000
Accumulated amortization	(150,392,000)	(119,464,000)
Lease intangibles assets, net	98,723,000	128,893,000
Estimated future amortization, and the increasing (decreasing) effect on minimum rents
2014	(22,020,000)
2015	(19,441,000)
2016	(17,468,000)
2017	(13,889,000)
2018	(11,062,000)
Thereafter	(14,843,000)
Lease intangibles assets, net	$ (98,723,000)