Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Scheduled future amortization of intangible assets [Abstract]
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	$ 241,663	$ 222,448
Deferred Financing Costs [Member]
Scheduled future amortization of intangible assets [Abstract]
2016	3,185
2017	2,693
2018	1,530
2019	1,116
2020	804
Thereafter	570
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	$ 9,898	11,525
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	3 years 10 months 24 days
Deferred Leasing Costs and Acquisition-Related Intangible Assets [Member]
Scheduled future amortization of intangible assets [Abstract]
2016	$ 45,903
2017	38,580
2018	31,827
2019	26,161
2020	21,584
Thereafter	45,008
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	$ 209,063
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	6 years 7 months 6 days
Lease Incentives [Member]
Scheduled future amortization of intangible assets [Abstract]
2016	$ 1,254
2017	1,175
2018	1,076
2019	880
2020	652
Thereafter	1,883
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	$ 6,920
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	7 years 4 months 24 days
Acquisition-Related Intangible Assets (in Rental and Other Revenue) [Member]
Scheduled future amortization of intangible assets [Abstract]
2016	$ 3,808
2017	2,671
2018	1,709
2019	1,306
2020	989
Thereafter	2,562
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	$ 13,045
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	6 years 1 month 6 days
Acquired intangible assets, weighted average useful life (in years)	5 years
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)	5 years 8 months 12 days
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member]
Scheduled future amortization of intangible assets [Abstract]
2016	$ 553
2017	553
2018	553
2019	553
2020	525
Thereafter	0
Deferred financing and leasing costs, net/Total scheduled future amortization of intangible assets	$ 2,737
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	5 years
Acquisition-Related Below Market Lease Liabilities [Member]
Scheduled future amortization of below market lease liabilites [Abstract]
2016	$ (6,969)
2017	(6,626)
2018	(6,231)
2019	(5,739)
2020	(5,410)
Thereafter	(14,928)
Total scheduled future amortization of below market lease liabilities	$ (45,903)	$ (42,235)
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Below market lease liabilities, weighted average useful life (in years)	7 years 10 months 24 days
Assumed finite-lived below market lease liabilities, weighted average useful life (in years)	9 years 7 months 6 days