Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Scheduled future amortization of intangible assets [Abstract]
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 213,500	$ 231,765
Deferred Leasing Costs and Acquisition-Related Intangible Assets [Member]
Scheduled future amortization of intangible assets [Abstract]
2017	42,508
2018	34,925
2019	29,332
2020	24,727
2021	20,510
Thereafter	42,030
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 194,032
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]
2017	$ 1,478
2018	1,374
2019	1,160
2020	882
2021	678
Thereafter	2,396
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 7,968
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	7 years 9 months 18 days
Acquisition-Related Intangible Assets (in Rental and Other Revenue) [Member]
Scheduled future amortization of intangible assets [Abstract]
2017	$ 2,626
2018	1,713
2019	1,322
2020	1,002
2021	681
Thereafter	1,972
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 9,316
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	6 years 4 months 24 days
Acquired intangible assets, weighted average useful life (in years)	9 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)	9 years 10 months 24 days
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member]
Scheduled future amortization of intangible assets [Abstract]
2017	$ 553
2018	553
2019	553
2020	525
2021	0
Thereafter	0
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 2,184
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Intangible assets, weighted average useful life (in years)	4 years
Acquisition-Related Below Market Lease Liabilities [Member]
Scheduled future amortization of below market lease liabilites [Abstract]
2017	$ (6,231)
2018	(5,966)
2019	(5,495)
2020	(5,183)
2021	(4,411)
Thereafter	(10,861)
Total scheduled future amortization of below market lease liabilities	$ (38,147)	$ (45,903)
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract]
Below market lease liabilities, weighted average useful life (in years)	7 years 3 months 18 days
Assumed finite-lived below market lease liabilities, weighted average useful life (in years)	10 years 10 months 24 days