Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Scheduled future amortization of intangible assets [Abstract]
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	$ 222,211	$ 163,964
Deferred Financing Costs [Member]
Scheduled future amortization of intangible assets [Abstract]
2014	2,786
2015	2,751
2016	2,486
2017	2,191
2018	1,084
Thereafter	861
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	12,159	13,897
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	4 years 8 months 12 days
Deferred Leasing Costs and Acquisition-Related Intangible Assets [Member]
Scheduled future amortization of intangible assets [Abstract]
2014	38,631
2015	32,150
2016	26,535
2017	22,568
2018	18,323
Thereafter	43,097
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	181,304
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	6 years 9 months 19 days
Lease Incentives [Member]
Scheduled future amortization of intangible assets [Abstract]
2014	1,266
2015	1,027
2016	851
2017	777
2018	674
Thereafter	2,073
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	6,668
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	7 years 11 months
Acquisition-Related Intangible Assets (in Rental and Other Revenue) [Member]
Scheduled future amortization of intangible assets [Abstract]
2014	4,338
2015	3,622
2016	2,810
2017	2,268
2018	1,424
Thereafter	3,767
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	18,229
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	6 years 8 months 12 days
Acquired intangible assets, weighted average useful life (in years)	6 years 6 months
Acquisition-Related Intangible Assets (amortized in Depreciation and Amortization) [Member]
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Acquired intangible assets, weighted average useful life (in years)	6 years 6 months
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member]
Scheduled future amortization of intangible assets [Abstract]
2014	553
2015	553
2016	553
2017	553
2018	553
Thereafter	1,086
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	3,851
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	7 years
Acquisition-Related Below Market Lease Liabilities [Member]
Scheduled future amortization of below market lease liabilites [Abstract]
2014	(5,991)
2015	(5,722)
2016	(5,429)
2017	(5,165)
2018	(5,017)
Thereafter	(19,521)
Total scheduled future amortization of below market lease liabilities	$ (46,845)	$ (33,636)
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Below market lease liabilities, weighted average useful life (in years)	9 years 1 month 7 days
Assumed finite-lived below market lease liabilities, weighted average useful life (in years)	8 years 11 months