Intangible Assets

The gross carrying amount and accumulated amortization of the Company’s intangible assets as of March 31, 2020 and December 31, 2019 are as follows (dollars in thousands):



	Indefinite-Lived						Definite-Lived												Total
Gross Carrying Amount	FCC licenses			Trademarks			Affiliate and producer relationships			Broadcast advertising			Tower income contracts			Other
Balance as of December 31, 2019	$	830,490		$	19,921		$	130,000		$	32,000		$	13,721		$	11,191		$	1,037,323
Dispositions	(52		)	(2		)	—			—			(1		)	(45		)	(100		)
Balance as of March 31, 2020	$	830,438		$	19,919		$	130,000		$	32,000		$	13,720		$	11,146		$	1,037,223

Accumulated Amortization
Balance as of December 31, 2019	$	—		$	—		$	(18,712	)	$	(10,133	)	$	(2,414	)	$	(11,191	)	$	(42,450	)
Amortization Expense	—			—			(2,955		)	(1,600		)	(381		)	—			(4,936		)
Dispositions	—			—			—			—			—			45			45
Balance as of March 31, 2020	$	—		$	—		$	(21,667	)	$	(11,733	)	$	(2,795	)	$	(11,146	)	$	(47,341	)
Net Book Value as of March 31, 2020	$	830,438		$	19,919		$	108,333		$	20,267		$	10,925		$	—		$	989,882

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, primarily broadcast advertising and affiliate relationships, for recoverability prior to its annual impairment test and whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. The Company considered the current and expected future economic and market conditions surrounding COVID-19 and other potential indicators of impairment and determined a triggering event had not occurred which would necessitate any interim impairment tests during the three months ended March 31, 2020. We will continue to monitor changes in economic and market conditions related to COVID-19 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.