Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Scheduled future amortization of intangible assets [Abstract]
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 216,318	$ 209,329
Scheduled future amortization of below market lease liabilities [Abstract]
Total scheduled future amortization of acquisition-related below market lease liabilities	(24,422)	$ (25,910)
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, 2021	18,331
2022	33,657
2023	29,975
2024	26,604
2025	21,634
Thereafter	69,158
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 199,359
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
Acquired intangible assets, weighted average useful life (in years)	5 years 9 months 18 days
Lease Incentives (in Rental and Other Revenues) [Member]
Scheduled future amortization of intangible assets [Abstract]
July 1 through December 31, 2021	$ 791
2022	1,493
2023	1,421
2024	1,273
2025	1,195
Thereafter	4,975
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 11,148
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 2 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, 2021	$ 484
2022	910
2023	754
2024	664
2025	546
Thereafter	2,453
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 5,811
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 9 months 18 days
Acquired intangible assets, weighted average useful life (in years)	7 years 2 months 12 days
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, 2021	$ (2,336)
2022	(4,214)
2023	(3,838)
2024	(3,171)
2025	(1,813)
Thereafter	(9,050)
Total scheduled future amortization of acquisition-related below market lease liabilities	$ (24,422)
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, weighted average useful life (in years)	5 years 8 months 12 days