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Goodwill and Other Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill
Goodwill and other intangible assets consisted of the following (amounts in thousands):
At September 30, 2023At December 31, 2022
Gross Book ValueAccumulated AmortizationNet Book ValueGross Book ValueAccumulated AmortizationNet Book Value
Goodwill$165,843 $— $165,843 $165,843 $— $165,843 
Shurgard® Trade Name18,824 — 18,824 18,824 — 18,824 
Finite-lived intangible assets, subject to amortization981,254 (751,630)229,624 758,106 (710,256)47,850 
Total goodwill and other intangible assets$1,165,921 $(751,630)$414,291 $942,773 $(710,256)$232,517 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The estimated future amortization expense for our finite-lived intangible assets at September 30, 2023 is as follows (amounts in thousands):
YearAmount
Remainder of 2023$39,491 
2024108,871 
202556,693 
202618,013 
20272,687 
Thereafter3,869 
Total$229,624