Real Estate (Property Acquisition Table) (Details) $ in Thousands		Sep. 02, 2021 USD ($) ft²	Jun. 14, 2021 USD ($) ft²	Jun. 01, 2021 USD ($) ft²	Apr. 30, 2021 USD ($) ft²	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Property Acquisitions
Operating lease right of use assets						$ 91,836	$ 92,248
Operating lease liabilities						$ 73,609	$ 72,441
Chesterbrook
Property Acquisitions
Square footage of real estate property | ft²	[1]				90,000
Ownership %	[1]				80.00%
Gross value of real estate	[1],[2]				$ 32,100
Grossmont Center
Property Acquisitions
Square footage of real estate property | ft²	[1]			933,000
Ownership %	[1]			60.00%
Gross value of real estate	[1],[3]			$ 175,000
Camelback Colonnade
Property Acquisitions
Square footage of real estate property | ft²	[1]		642,000
Ownership %	[1]		98.00%
Gross value of real estate	[1],[4]		$ 162,500
Hilton Village
Property Acquisitions
Square footage of real estate property | ft²	[1]		93,000
Ownership %	[1]		98.00%
Gross value of real estate	[1],[5]		$ 37,500
Operating lease right of use assets			10,400
Above Market Liability			1,300
Operating lease liabilities			11,600
Twinbrooke Shopping Centre
Property Acquisitions
Square footage of real estate property | ft²		109,000
Ownership %		100.00%
Gross value of real estate	[6]	$ 33,800
Other Assets | Acquired lease costs | Chesterbrook
Property Acquisitions
Above market leases					1,900
Other Assets | Acquired lease costs | Grossmont Center
Property Acquisitions
Above market leases				12,300
Other Assets | Acquired lease costs | Camelback Colonnade
Property Acquisitions
Above market leases			11,600
Other Assets | Acquired lease costs | Hilton Village
Property Acquisitions
Above market leases			2,700
Other Assets | Acquired lease costs | Twinbrooke Shopping Centre
Property Acquisitions
Above market leases		800
Other Assets | Above market leases | Chesterbrook
Property Acquisitions
Above market leases					600
Other Assets | Above market leases | Grossmont Center
Property Acquisitions
Above market leases				2,600
Other Assets | Above market leases | Hilton Village
Property Acquisitions
Above market leases			1,100
Other Assets | Above market leases | Twinbrooke Shopping Centre
Property Acquisitions
Above market leases		300
Other Liabilities | Chesterbrook
Property Acquisitions
Below market leases					$ 8,000
Other Liabilities | Grossmont Center
Property Acquisitions
Below market leases				$ 14,700
Other Liabilities | Camelback Colonnade
Property Acquisitions
Below market leases			28,300
Other Liabilities | Hilton Village
Property Acquisitions
Below market leases			$ 3,600
Other Liabilities | Twinbrooke Shopping Centre
Property Acquisitions
Below market leases		$ 2,700

[1] These acquisitions were completed through newly formed joint ventures, for which we own the controlling interest listed above, and therefore, these properties are consolidated in our financial statements.

[2] Approximately $1.9 million and $0.6 million of net assets acquired were allocated to other assets for "acquired lease costs" and "above market leases," respectively, and $8.0 million of net assets acquired were allocated to other liabilities for "below market leases."

[3] Approximately $12.3 million and $2.6 million of net assets acquired were allocated to other assets for "acquired lease costs" and "above market leases," respectively, and $14.7 million of net assets acquired were allocated to other liabilities for "below market leases."

[4] Approximately $11.6 million of net assets acquired were allocated to other assets for "acquired lease costs" and $28.3 million were allocated to other liabilities for "below market leases."

[5] The land is controlled under a long-term ground lease that expires on December 31, 2076, for which we have recorded a $10.4 million "operating lease right of use asset" (net of a $1.3 million above market liability) and an $11.6 million "operating lease liability." Approximately $2.7 million and $1.1 million of net assets acquired were allocated to other assets for "acquired lease costs" and "above market leases," respectively, and $3.6 million were allocated to other liabilities for "below market leases."

[6] Approximately $0.8 million and $0.3 million of net assets acquired were allocated to other assets for "acquired lease costs" and "above market leases," respectively, and $2.7 million of net assets acquired were allocated to other liabilities for "below market leases."