Goodwill And Other Intangible Assets

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill And Other Intangible Assets

Goodwill and Other Intangible Assets

The carrying amount of goodwill, by operating segment is as follows:

(In thousands)	National Networks			International and Other			Total
December 31, 2017	$	239,759		$	455,399		$	695,158
Additions	—			25,278			25,278
Amortization of "second component" goodwill	(656		)	—			(656		)
Foreign currency translation	—			(9,733		)	(9,733		)
June 30, 2018	$	239,103		$	470,944		$	710,047

The increase in the carrying amount of goodwill for the International and Other segment relates to the acquisition of Levity (see Note 4).

The reduction of $0.7 million in the carrying amount of goodwill for the National Networks is due to the realization of a tax benefit for the amortization of "second component" goodwill at SundanceTV. Second component goodwill is the amount of tax deductible goodwill in excess of goodwill for financial reporting purposes. In accordance with the authoritative guidance at the time of the SundanceTV acquisition, the tax benefits associated with this excess are applied to first reduce the amount of goodwill, and then other intangible assets for financial reporting purposes, if and when such tax benefits are realized in the Company's tax returns.

The following tables summarize information relating to the Company's identifiable intangible assets:

(In thousands)	June 30, 2018
	Gross		Accumulated Amortization			Net		Estimated Useful Lives
Amortizable intangible assets:
Affiliate and customer relationships	$	548,389	$	(181,307	)	$	367,082	6 to 25 years
Advertiser relationships	46,282		(15,509		)	30,773		11 years
Trade names	71,493		(15,353		)	56,140		15 to 20 years
Other amortizable intangible assets	11,390		(6,122		)	5,268		2 to 15 years
Total amortizable intangible assets	677,554		(218,291		)	459,263
Indefinite-lived intangible assets:
Trademarks	19,900		—			19,900
Total intangible assets	$	697,454	$	(218,291	)	$	479,163
(In thousands)	December 31, 2017
	Gross		Accumulated Amortization			Net
Amortizable intangible assets:
Affiliate and customer relationships	$	527,713	$	(167,911	)	$	359,802
Advertiser relationships	46,282		(13,405		)	32,877
Trade names	53,761		(14,420		)	39,341
Other amortizable intangible assets	11,401		(6,079		)	5,322
Total amortizable intangible assets	639,157		(201,815		)	437,342
Indefinite-lived intangible assets:
Trademarks	19,900		—			19,900
Total intangible assets	$	659,057	$	(201,815	)	$	457,242

The increase in amortizable intangible assets is a result of the acquisition of Levity.

Aggregate amortization expense for amortizable intangible assets for the six months ended June 30, 2018 and 2017 was $19.1 million and $18.1 million, respectively. Estimated aggregate amortization expense for intangible assets subject to amortization for each of the following five years is:

(In thousands)
Years Ending December 31,
2018	$	38,555
2019	39,553
2020	39,195
2021	39,193
2022	39,181