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Share-Based Compensation (Share-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Share-based compensation cost capitalized	$ 800		$ 3,100
Share-based Payment Arrangement, Expensed, Amount [Line Items]
Share-based compensation expense	14,595	$ 8,766	47,685	$ 21,630
Self-storage cost of operations
Share-based Payment Arrangement, Expensed, Amount [Line Items]
Share-based compensation expense	4,506	3,488	16,272	10,550
Ancillary cost of operations
Share-based Payment Arrangement, Expensed, Amount [Line Items]
Share-based compensation expense	343	0	1,394	0
General and administrative
Share-based Payment Arrangement, Expensed, Amount [Line Items]
Share-based compensation expense	$ 9,746	$ 5,278	$ 30,019	$ 11,080

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Amount of cost capitalized for award under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(ii)
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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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