Intangible assets subject to amortization consisted of the following (in thousands):

	Estimated	September 30, 2020							December 31, 2019
	useful life,			Accumulated							Accumulated
	in years	Gross		Amortization			Net		Gross		Amortization			Net
Network affiliation agreements	15	$	3,118,357	$	(827,673	)	$	2,290,684	$	3,223,906	$	(691,640	)	$	2,532,266
Other definite-lived intangible assets	1-20		965,293		(300,893	)		664,400		961,350		(233,996	)		727,354
Other intangible assets		$	4,083,650	$	(1,128,566	)	$	2,955,084	$	4,185,256	$	(925,636	)	$	3,259,620

The following table presents the Company’s estimate of amortization expense for the remainder of 2020, each of the five succeeding years ended December 31 and thereafter for definite-lived intangible assets as of September 30, 2020 (in thousands):

Remainder of 2020	$	72,775
2021		271,338
2022		268,939
2023		266,054
2024		264,272
Thereafter		1,811,706
	$	2,955,084

The amounts recorded to goodwill and FCC licenses were as follows (in thousands):

	Goodwill									FCC Licenses
				Accumulated									Accumulated
	Gross			Impairment			Net			Gross			Impairment			Net
Balances as of December 31, 2019	$	3,129,169		$	(132,294	)	$	2,996,875		$	2,968,875		$	(47,410	)	$	2,921,465
Current year acquisitions (See Note 3)		7,643			-			7,643			39,217			-			39,217
Current year divestitures (See Note 3)		(48,429	)		-			(48,429	)		(104,308	)		-			(104,308	)
Measurement period adjustments related to Nexstar and Tribune merger (See Note 3)		(94,775	)		-			(94,775	)		-			-			-
Balances as of September 30, 2020	$	2,993,608		$	(132,294	)	$	2,861,314		$	2,903,784		$	(47,410	)	$	2,856,374

In each of the first three quarters of 2020, the Company evaluated the changes in facts and circumstances and general market declines resulting from the COVID-19 pandemic, including their impact on its current operating results and whether an impairment triggering event has occurred on its indefinite-lived intangible assets, long-lived assets (including finite-lived intangible assets) and reporting units with goodwill. Based on the results of the evaluation, the Company concluded that, as of September 30, 2020, no impairment triggering events had occurred on these assets, mainly because as of this date, the Company’s market capitalization exceeded the carrying amount of its equity by a substantial amount. Despite the adverse effects of COVID-19 in the Company’s financial results, mostly in the first part of the second quarter of 2020, there were significant improvements in the Company’s financial results as certain areas throughout the United States permitted the re-opening of non-essential businesses which has had a favorable impact to the macroeconomic environment and to the Company’s revenue. In the third quarter of 2020 and on a year to date basis, the Company remained profitable. There were also no material changes in its customer mix, including advertisers, multichannel video programming distributors and online video distributors. Due to the continued impact of the COVID-19 pandemic subsequent to September 30, 2020, the Company will continue to evaluate its indefinite-lived intangible assets, long-lived assets and goodwill to determine if an impairment triggering event will occur in future periods. Any further adverse impact of COVID-19 or the general market conditions on the Company’s operating results could reasonably be expected to negatively impact the fair value of the Company’s indefinite-lived intangible assets and its reporting units as well as the recoverability of its long-lived assets and may result in future impairment charges which could be material.