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Intangible Assets, Goodwill and Other (Tables)
12 Months Ended
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, 2021As of December 31, 2020
Gross Carrying ValueAccumulated AmortizationNet Book ValueGross Carrying ValueAccumulated AmortizationNet Book Value
Site rental contracts and tenant relationships
$7,854 $(3,872)$3,982 $7,797 $(3,432)$4,365 
Other intangible assets143 (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,
20222023202420252026
Estimated annual amortization$447 $445 $396 $374 $370