Other Intangible Assets

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Our identifiable intangible assets are as follows (in thousands):


		As of December 31, 2023						As of December 31, 2022
	Useful Life	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Intangible assets subject to amortization:
Customer relationships	11.6 years	$	210,000	$	(28,664)	$	181,336	$	210,000	$	(10,560)	$	199,440
Marketing contract	20 years	144,219		(42,064)		102,155		144,219		(34,853)		109,366
Rights-of-way assets	8 - 35 years	14,892		(1,078)		13,814		13,490		(377)		13,113
Intangible assets not subject to amortization:
Rights-of-way assets	Indefinite	45,722				45,722		42,877				42,877
Total		$	414,833	$	(71,806)	$	343,027	$	410,586	$	(45,790)	$	364,796

Amortization of the rights-of-way assets and customer relationships intangible asset was $18.7 million for the year ended December 31, 2023, and is included in depreciation and amortization on the accompanying consolidated statements of income and comprehensive income. Amortization of the marketing contract was $7.2 million during the years ended December 31, 2023, 2022 and 2021, and is included as a reduction of net revenue on the accompanying consolidated statements of income and comprehensive income.

Amortization expense is estimated to be $0.6 million $7.2 million and $18.1 million for the rights-of-way assets, marketing contract intangible and the customer relationship intangible, respectively, for each of the years ended December 31, 2024 through 2028.