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Goodwill and Other Intangible Assets | 9 Months Ended
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Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets Goodwill and other intangible assets consisted of the following (amounts in thousands):
| At September 30, 2022 |  | At December 31, 2021
| Gross Book Value |  | Accumulated Amortization |  | Net Book Value |  | Gross Book Value |  | Accumulated Amortization |  | Net Book Value
Goodwill | $ | 165,843 |  |  | $ | — |  |  | $ | 165,843 |  |  | $ | 165,843 |  |  | $ | — |  |  | $ | 165,843 |
Shurgard® Trade Name | 18,824 |  |  | — |  |  | 18,824 |  |  | 18,824 |  |  | — |  |  | 18,824 |
Finite-lived intangible assets, subject to amortization | 196,617 |  |  | (141,473) |  |  | 55,144 |  |  | 198,180 |  |  | (79,953) |  |  | 118,227 |
Total goodwill and other intangible assets | $ | 381,284 |  |  | $ | (141,473) |  |  | $ | 239,811 |  |  | $ | 382,847 |  |  | $ | (79,953) |  |  | $ | 302,894 |
Finite-lived intangible assets consist primarily of acquired customers in place. Amortization expense related to intangible assets subject to amortization was $20.0 million and $78.2 million for the three and nine months ended September 30, 2022, respectively, and $23.3 million and $49.0 million for the same periods in 2021. During the nine months ended September 30, 2022, intangibles increased $15.1 million in connection with the acquisition of real estate facilities. (Note 3). The estimated future amortization expense for our finite-lived intangible assets at September 30, 2022 is as follows (amounts in thousands):
Year |  | Amount
Remainder of 2022 |  | $ | 15,830 |
2023 |  | 30,074 |
Thereafter |  | 9,240 |
Total |  | $ | 55,144 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI https://asc.fasb.org/topic&trid=2144416 + Details
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