7. Intangible Assets and Goodwill

Intangible assets and goodwill relate to the allocation of purchase price associated with the Refinitiv Transaction (see Note 3 – Pushdown Accounting).

The following is a summary of intangible assets which have an indefinite useful life at both September 30, 2019 and December 31, 2018 (in thousands):


	Amount
Licenses	$	168,800
Tradename		154,300
Total	$	323,100

Intangible assets that are subject to amortization, including the related accumulated amortization, are comprised as follows (in thousands):


		Successor						Successor
		September 30, 2019						December 31, 2018
	Amortization			Accumulated		Net Carrying				Accumulated		Net Carrying
	Period	Cost		Amortization		Amount		Cost		Amortization		Amount
Customer relationships	12 Years	$	928,200	$	(77,350)	$	850,850	$	928,200	$	(19,338)	$	908,862
Content and data	7 Years		154,400		(22,057)		132,343		154,400		(5,514)		148,886
		$	1,082,600	$	(99,407)	$	983,193	$	1,082,600	$	(24,852)	$	1,057,748

Amortization expense relating to intangible assets was $24.9 million and $74.6 million, respectively, for the three and nine months ended September 30, 2019, and $6.5 million and $19.6 million, respectively, for the three and nine months ended September 30, 2018.

The estimated annual future amortization for existing intangibles assets through December 31, 2023 is as follows (in thousands):


	Amount
Remainder of 2019	$	24,852
2020		99,408
2021		99,408
2022		99,408
2023		99,408