Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Scheduled future amortization of intangible assets [Abstract]
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 219,790	$ 209,329
Scheduled future amortization of below market lease liabilities [Abstract]
Total scheduled future amortization of acquisition-related below market lease liabilities	(25,843)	$ (25,910)
Deferred Leasing Costs and Acquisition-Related Intangible Assets (in Depreciation and Amortization) [Member]
Scheduled future amortization of intangible assets [Abstract]
April 1 through December 31, 2021	27,307
2022	32,692
2023	29,031
2024	25,668
2025	20,705
Thereafter	67,577
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 202,980
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 2 months 12 days
Acquired intangible assets, weighted average useful life (in years)	5 years 10 months 24 days
Lease Incentives (in Rental and Other Revenues) [Member]
Scheduled future amortization of intangible assets [Abstract]
April 1 through December 31, 2021	$ 1,169
2022	1,396
2023	1,322
2024	1,173
2025	1,095
Thereafter	4,603
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 10,758
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 4 months 24 days
Acquisition-Related Intangible Assets (in Rental and Other Revenues) [Member]
Scheduled future amortization of intangible assets [Abstract]
April 1 through December 31, 2021	$ 725
2022	910
2023	754
2024	664
2025	546
Thereafter	2,453
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 6,052
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
Acquired intangible assets, weighted average useful life (in years)	7 years 4 months 24 days
Acquisition-Related Below Market Lease Liabilities (in Rental and Other Revenues) [Member]
Scheduled future amortization of below market lease liabilities [Abstract]
April 1 through December 31, 2021	$ (3,757)
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	$ (25,843)
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 10 months 24 days