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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
The following is a summary of intangible assets at December 31, 2023 and 2022:
Estimated
Life
(Years)		20232022
Gross Carrying
Amount		Accumulated
Amortization		Gross Carrying
Amount		Accumulated
Amortization
Amortizable Intangible Assets:
Customer lists and contracts
7 — 10
$731,156 $640,635 $720,051 $614,840 
Non-competition agreements
3 — 15
71,960 66,455 71,599 65,647 
Site locations152,955,324 1,891,078 2,864,854 1,781,164 
Other
2 — 15
52,578 41,416 52,164 40,392 
$3,811,018 $2,639,584 $3,708,668 $2,502,043 
Unamortizable Intangible Assets:
Goodwill$2,288,807 $253,536 $2,288,805 $253,536 
The changes in the gross carrying amount of goodwill for the years ended December 31, 2023 and 2022 are as follows:
Balance as of December 31, 2021$2,189,962 
Goodwill acquired during the year99,003 
Purchase price adjustments and other(160)
Balance as of December 31, 2022$2,288,805 
Purchase price adjustments and other2 
Balance as of December 31, 2023$2,288,807 
Amortization expense for the years ended December 31, 2023, 2022 and 2021 was $140,033, $134,256 and $114,319, respectively. The following is a summary of the estimated amortization expense for future years:
2024$136,705 
2025133,235 
2026125,223 
2027121,230 
2028114,693 
Thereafter540,348 
Total$1,171,434