Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 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	$ 218,725	$ 218,725	$ 222,211
Deferred Financing Costs [Member]
Scheduled future amortization of intangible assets [Abstract]
October 1, 2014 through December 31, 2014	776	776
2015	3,074	3,074
2016	2,811	2,811
2017	2,518	2,518
2018	1,394	1,394
Thereafter	1,746	1,746
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	12,319	12,319	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 7 months 6 days
Deferred Leasing Costs and Acquisition-Related Intangible Assets [Member]
Scheduled future amortization of intangible assets [Abstract]
October 1, 2014 through December 31, 2014	10,411	10,411
2015	36,795	36,795
2016	30,965	30,965
2017	26,845	26,845
2018	22,423	22,423
Thereafter	53,619	53,619
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	181,058	181,058
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 9 months 20 days
Lease Incentives [Member]
Scheduled future amortization of intangible assets [Abstract]
October 1, 2014 through December 31, 2014	339	339
2015	1,148	1,148
2016	986	986
2017	908	908
2018	805	805
Thereafter	2,782	2,782
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	6,968	6,968
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 12 days
Acquisition-Related Intangible Assets (in Rental and Other Revenues) [Member]
Scheduled future amortization of intangible assets [Abstract]
October 1, 2014 through December 31, 2014	1,034	1,034
2015	3,612	3,612
2016	2,819	2,819
2017	2,276	2,276
2018	1,434	1,434
Thereafter	3,771	3,771
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	14,946	14,946
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
Acquired finite-lived intangible assets, average useful life (in years)	3 years 6 months
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member]
Scheduled future amortization of intangible assets [Abstract]
October 1, 2014 through December 31, 2014	136	136
2015	553	553
2016	553	553
2017	553	553
2018	553	553
Thereafter	1,086	1,086
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	3,434	3,434
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 2 months 12 days
Acquisition-Related Below Market Lease Liabilities [Member]
Scheduled future amortization of below market lease liabilities [Abstract]
October 1, 2014 through December 31, 2014	(1,560)	(1,560)
2015	(5,978)	(5,978)
2016	(5,696)	(5,696)
2017	(5,424)	(5,424)
2018	(5,285)	(5,285)
Thereafter	(19,702)	(19,702)
Total scheduled future amortization of acquisition-related below market lease liabilities	$ (43,645)	$ (43,645)	$ (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 4 months 24 days
Assumed finite-lived below market lease liabilities, average useful life (in years)	4 years 11 months 15 days
In-Place Lease Intangible Assets [Member]
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Acquired finite-lived intangible assets, average useful life (in years)	5 years 6 months