Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Scheduled future amortization of intangible assets [Abstract]
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 225,258	$ 231,347
Scheduled future amortization of below market lease liabilities [Abstract]
Total scheduled future amortization of acquisition-related below market lease liabilities	(30,392)	$ (31,957)
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, 2020	28,126
2021	33,372
2022	29,147
2023	25,709
2024	22,696
Thereafter	70,546
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 209,596
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]
April 1 through December 31, 2020	$ 1,231
2021	1,386
2022	1,176
2023	1,094
2024	952
Thereafter	4,253
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 10,092
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]
April 1 through December 31, 2020	$ 807
2021	777
2022	608
2023	454
2024	380
Thereafter	2,173
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 5,199
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 Property and Other Expenses) [Member]
Scheduled future amortization of intangible assets [Abstract]
April 1 through December 31, 2020	$ 371
2021	0
2022	0
2023	0
2024	0
Thereafter	0
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	$ 371
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract]
Finite-lived intangible assets, average useful life (in years)	8 months 12 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, 2020	$ (4,391)
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	$ (30,392)
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