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Share-Based Compensation (Share-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Share-Based Payment Arrangement [Abstract] |  |  |  |
Share-based compensation cost capitalized | $ 400 | $ 800 | $ 2,400 | $ 3,100
Share-based Payment Arrangement, Expensed, Amount [Line Items] |  |  |  |
Share-based compensation expense | 13,741 | 14,595 | 44,597 | 47,685
Self-storage cost of operations |  |  |  |
Share-based Payment Arrangement, Expensed, Amount [Line Items] |  |  |  |
Share-based compensation expense | 4,203 | 4,506 | 13,740 | 16,272
Ancillary cost of operations |  |  |  |
Share-based Payment Arrangement, Expensed, Amount [Line Items] |  |  |  |
Share-based compensation expense | 203 | 342 | 690 | 1,122
General and administrative |  |  |  |
Share-based Payment Arrangement, Expensed, Amount [Line Items] |  |  |  |
Share-based compensation expense | $ 9,335 | $ 9,747 | $ 30,167 | $ 30,291

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of cost capitalized for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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