Goodwill and Intangible Assets

As of

September 30, 2018

and

December 31, 2018,

our intangible assets and related accumulated amortization consisted of the following (in thousands):

	As of September 30, 2018							As of December 31, 2017
			Accumulated							Accumulated
	Gross		Amortization			Net		Gross		Amortization			Net
Intangible assets not currently subject to amortization:
Broadcast licenses	$	1,584,452	$	(53,699	)	$	1,530,753	$	1,584,402	$	(53,699	)	$	1,530,703
Goodwill		614,177		-			614,177		611,100		-			611,100
	$	2,198,629	$	(53,699	)	$	2,144,930	$	2,195,502	$	(53,699	)	$	2,141,803

Intangible assets subject to amortization:
Network affiliation agreements	$	6,134	$	(5,488	)	$	646	$	6,134	$	(3,551	)	$	2,583
Other definite lived intangible assets		143,446		(85,895	)		57,551		143,446		(72,245	)		71,201
	$	149,580	$	(91,383	)	$	58,197	$	149,580	$	(75,796	)	$	73,784

Total intangibles	$	2,348,209	$	(145,082	)	$	2,203,127	$	2,345,082	$	(129,495	)	$	2,215,587

Amortization expense for the

nine

-month periods ended

September 30, 2018

and

2017

was

$15.6

million and

$18.7

million, respectively. Based on the intangible assets subject to amortization as of

September 30, 2018,

we expect that amortization expense for the remainder of

2018

would be approximately

$5.0

million, and, for the succeeding

five

years, amortization expense will be approximately as follows:

2019,

$15.4

million;

2020,

$12.4

million;

2021,

$8.3

million;

2022,

$4.8

million; and

2023,

$2.9

million. If and when acquisitions and dispositions occur in the future, actual amounts

may

vary materially from these estimates.

During the

third

quarter of

2018

we made a measurement period adjustment to reduce the value of other intangible assets and to increase the value of goodwill in the amount of

$3.1

million related to our acquisition of WCAX-TV.

Impairment of goodwill and broadcast licenses

Our intangible assets are primarily comprised of broadcast licenses. There were

triggering events that required a test of our goodwill or intangible assets for impairment during the

nine

-months ended

September 30, 2018

2017.