Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Scheduled future amortization of intangible assets [Abstract]
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 205,256	$ 213,500
Scheduled future amortization of below market lease liabilities [Abstract]
Total scheduled future amortization of acquisition-related below market lease liabilities	(34,975)	$ (38,147)
Deferred Leasing Costs and Acquisition-Related Intangible Assets (in Depreciation and Amortization) [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1 through December 31, 2017	21,126
2018	36,533
2019	30,942
2020	26,160
2021	21,887
Thereafter	50,280
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 186,928
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 8 months 12 days
Lease Incentives (in Rental and Other Revenues) [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1 through December 31, 2017	$ 810
2018	1,510
2019	1,286
2020	1,011
2021	797
Thereafter	3,404
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 8,818
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 8 months 12 days
Acquisition-Related Intangible Assets (in Rental and Other Revenues) [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1 through December 31, 2017	$ 1,140
2018	1,680
2019	1,286
2020	967
2021	647
Thereafter	1,885
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 7,605
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 4 months 24 days
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1 through December 31, 2017	$ 274
2018	553
2019	553
2020	525
2021	0
Thereafter	0
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 1,905
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived intangible assets, average useful life (in years)	3 years 6 months
Acquisition-Related Below Market Lease Liabilities (in Rental and Other Revenues) [Member]
Scheduled future amortization of below market lease liabilities [Abstract]
July 1 through December 31, 2017	$ (3,073)
2018	(5,962)
2019	(5,492)
2020	(5,180)
2021	(4,409)
Thereafter	(10,859)
Total scheduled future amortization of acquisition-related below market lease liabilities	$ (34,975)
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)	7 years