Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements - Narrative (Details)	Dec. 31, 2019	Dec. 31, 2018	Aug. 30, 2016
Noncontrolling Interest [Line Items]
Ownership interest of noncontrolling interest	1.90%	2.00%
Consolidated property partnerships [Member] \| Norges Bank Real Estate Management (NBREM) [Member]
Noncontrolling Interest [Line Items]
Ownership interest of noncontrolling interest			44.00%