Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Scheduled future amortization of intangible assets [Abstract]
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	$ 218,022	$ 222,211
Deferred Financing Costs [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1, 2014 through December 31, 2014	1,558
2015	3,087
2016	2,823
2017	2,529
2018	1,404
Thereafter	1,732
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	13,133	12,159
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived intangible assets, average useful life (in years)	4 years 9 months 20 days
Deferred Leasing Costs and Acquisition-Related Intangible Assets [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1, 2014 through December 31, 2014	18,266
2015	34,839
2016	29,299
2017	25,379
2018	21,095
Thereafter	49,508
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	178,386
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived intangible assets, average useful life (in years)	6 years 6 months
Lease Incentives [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1, 2014 through December 31, 2014	689
2015	1,135
2016	934
2017	843
2018	748
Thereafter	2,580
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	6,929
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived intangible assets, average useful life (in years)	8 years 2 months 13 days
Acquisition-Related Intangible Assets (in Rental and Other Revenues) [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1, 2014 through December 31, 2014	2,107
2015	3,619
2016	2,810
2017	2,269
2018	1,426
Thereafter	3,768
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	15,999
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived intangible assets, average useful life (in years)	6 years 7 months 7 days
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1, 2014 through December 31, 2014	277
2015	553
2016	553
2017	553
2018	553
Thereafter	1,086
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	3,575
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived intangible assets, average useful life (in years)	6 years 6 months
Acquisition-Related Below Market Lease Liabilities [Member]
Scheduled future amortization of below market lease liabilities [Abstract]
July 1, 2014 through December 31, 2014	(2,979)
2015	(5,718)
2016	(5,427)
2017	(5,164)
2018	(5,016)
Thereafter	(19,519)
Total scheduled future amortization of acquisition-related below market lease liabilities	$ (43,823)	$ (46,845)
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived below market lease liabilities, average useful life (in years)	8 years 8 months 15 days