The gross carrying amount and accumulated amortization of the Company’s intangible assets as of March 31, 2025 and December 31, 2024 are as follows (dollars in thousands):


	Indefinite-Lived				Definite-Lived				Total
Gross Carrying Amount	Broadcast licenses		Trademarks		Affiliate and producer relationships		Tower income contracts
Balance as of December 31, 2024	$	518,165	$	16,383	$	145,000	$	13,505		$	693,053





Balance as of March 31, 2025	$	518,165	$	16,383	$	145,000	$	13,505		$	693,053

Accumulated Amortization
Balance as of December 31, 2024	$	—	$	—	$	(88,054)	$	(9,877)		$	(97,931)
Amortization expense	—		—		(3,704)		(376)			(4,080)



Balance as of March 31, 2025	$	—	$	—	$	(91,758)	$	(10,253)		$	(102,011)
Net Book Value as of March 31, 2025	$	518,165	$	16,383	$	53,242	$	3,252		$	591,042

The Company performs impairment testing of its indefinite-lived intangible assets annually as of December 31 of each year and on an interim basis if events or circumstances indicate that its indefinite-lived intangible assets may be impaired. The Company reviews the carrying amount of its definite-lived intangible assets for recoverability whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Events and circumstances did not necessitate any interim impairment tests during the three months ended March 31, 2025 and 2024, respectively. We will continue to monitor changes in economic and market conditions, and if any events or circumstances indicate a triggering event has occurred, we will perform an interim impairment test of our intangible assets at the appropriate time.