Related Party Transactions (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Interest and other income	$ 4,492	$ 1,510	$ 942
Royalty-free license agreement written notice of termination period minimum (in months)	6 months
Number of assets owned that are maintained by Public Storage | item	2
Property management contract written notice of termination period minimum (in days)	60 days
Management fee expenses	$ 98	96	92
Costs allocated from related party	75	65	61
Reimbursement to related party	1,200	1,200	1,300
Reimbursement from related party	39	38	31
Due to related parties	106
Due from related parties		43
Property Management [Member]
Related Party Transaction [Line Items]
Interest and other income	287	407	506
Operating expenses allocated to operating party	$ 373	$ 472	$ 537