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Franchises, Goodwill and Other Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Indefinite-lived and Finite-lived Intangible Assets
Indefinite-lived and finite-lived intangible assets consist of the following as of September 30, 2021 and December 31, 2020:

September 30, 2021December 31, 2020
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Indefinite-lived intangible assets:
Franchises$67,322 $— $67,322 $67,322 $— $67,322 
Goodwill29,554 — 29,554 29,554 — 29,554 
Wireless spectrum licenses464 — 464 464 — 464 
Trademarks159 — 159 159 — 159 
$97,499 $— $97,499 $97,499 $— $97,499 
Finite-lived intangible assets:
Customer relationships$18,232 $(13,813)$4,419 $18,230 $(12,615)$5,615 
Other intangible assets420 (187)233 420 (159)261 
$18,652 $(14,000)$4,652 $18,650 $(12,774)$5,876 
Expected Future Amortization Expense
The Company expects amortization expense on its finite-lived intangible assets will be as follows:

Three months ended December 31, 2021$375 
20221,332 
20231,075 
2024824 
2025576 
Thereafter470 
$4,652