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Intangible Assets, Goodwill and Other (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | The following is a summary of the Company's intangible assets.
| As of December 31, 2021 |  | As of December 31, 2020
| Gross Carrying Value |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Book Value
Site rental contracts and tenant relationships | $ | 7,854 |  |  | $ | (3,872) |  |  | $ | 3,982 |  |  | $ | 7,797 |  |  | $ | (3,432) |  |  | $ | 4,365 |
Other intangible assets | 143 |  |  | (79) |  |  | 64 |  |  | 143 |  |  | (75) |  |  | 68 |
Total | $ | 7,997 |  |  | $ | (3,951) |  |  | $ | 4,046 |  |  | $ | 7,940 |  |  | $ | (3,507) |  |  | $ | 4,433 |
Schedule of Estimated Annual Amortization Expense | The estimated annual amortization expense related to intangible assets for the years ending December 31, 2022 to 2026 is as follows:
| Years Ending December 31,
| 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026
Estimated annual amortization | $ | 447 |  |  | $ | 445 |  |  | $ | 396 |  |  | $ | 374 |  |  | $ | 370 |

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