Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Scheduled future amortization of intangible assets [Abstract]
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 221,905	$ 231,347
Scheduled future amortization of below market lease liabilities [Abstract]
Total scheduled future amortization of acquisition-related below market lease liabilities	(28,875)	$ (31,957)
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, 2020	18,951
2021	33,989
2022	29,787
2023	26,329
2024	23,306
Thereafter	74,561
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 206,923
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 4 months 24 days
Lease Incentives (in Rental and Other Revenues) [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1 through December 31, 2020	$ 831
2021	1,415
2022	1,204
2023	1,121
2024	975
Thereafter	4,325
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 9,871
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived intangible assets, average useful life (in years)	9 years 1 month 6 days
Acquisition-Related Intangible Assets (in Rental and Other Revenues) [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1 through December 31, 2020	$ 529
2021	767
2022	601
2023	447
2024	373
Thereafter	2,161
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 4,878
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived intangible assets, average useful life (in years)	9 years 6 months
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1 through December 31, 2020	$ 233
2021	0
2022	0
2023	0
2024	0
Thereafter	0
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 233
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived intangible assets, average useful life (in 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, 2020	$ (2,874)
2021	(5,013)
2022	(3,982)
2023	(3,607)
2024	(2,939)
Thereafter	(10,460)
Total scheduled future amortization of acquisition-related below market lease liabilities	$ (28,875)
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 8 months 12 days