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Other Intangible Assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets Other Intangible Assets
Our identifiable intangible assets are as follows (in thousands):
UsefulAccumulated
As of December 31, 2021LifeGrossAmortizationNet
Intangible assets subject to amortization:
Marketing contract 20$144,219 $(27,642)$116,577 
Intangible assets not subject to amortization:
Rights-of-way assets Indefinite37,280 37,280 
Total$181,499 $(27,642)$153,857 
UsefulAccumulated
As of December 31, 2020LifeGrossAmortizationNet
Intangible assets subject to amortization:
Marketing contract 20$144,219 $(20,431)$123,788 
Intangible assets not subject to amortization:
Rights-of-way assets Indefinite36,316 36,316 
Total$180,535 $(20,431)$160,104 
Amortization of intangible assets was $7.2 million during the years ended December 31, 2021, 2020 and 2019. It is included as a reduction of net revenue on the accompanying consolidated statements of income and comprehensive income. Amortization expense is estimated to be $7.2 million for each of the years ended December 31, 2022 through 2026.