Intangible Assets and Below Market Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Assets:
Deferred leasing costs (including lease incentives and above market lease and in-place lease acquisition-related intangible assets)	$ 371,696		$ 377,472
Deferred leasing costs, accumulated amortization	(146,438)		(146,125)
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	225,258		231,347
Liabilities (in accounts payable, accrued expenses and other liabilities):
Acquisition-related below market lease liabilities, gross	65,292		65,971
Acquisition-related below market lease liabilities, accumulated amortization	(34,900)		(34,014)
Acquisition-related below market lease liabilities, net	30,392		$ 31,957
Deferred Leasing Costs and Acquisition-Related Intangible Assets (in Depreciation and Amortization) [Member]
Assets:
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	209,596
Amortization of intangible assets and below market lease liabilities [Abstract]
Amortization of intangible assets	8,798	$ 10,315
Lease Incentives (in Rental and Other Revenues) [Member]
Assets:
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	10,092
Amortization of intangible assets and below market lease liabilities [Abstract]
Amortization of intangible assets	490	2,848
Acquisition-Related Intangible Assets (in Rental and Other Revenues) [Member]
Assets:
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	5,199
Amortization of intangible assets and below market lease liabilities [Abstract]
Amortization of intangible assets	288	357
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member]
Assets:
Deferred leasing costs, net/Total scheduled future amortization of intangible assets	371
Amortization of intangible assets and below market lease liabilities [Abstract]
Amortization of intangible assets	139	137
Acquisition-Related Below Market Lease Liabilities (in Rental and Other Revenues) [Member]
Liabilities (in accounts payable, accrued expenses and other liabilities):
Acquisition-related below market lease liabilities, net	30,392
Amortization of intangible assets and below market lease liabilities [Abstract]
Amortization of acquisition-related below market lease liabilities	$ (1,566)	$ (1,653)