4. 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 December 31, 2019 and 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
		December 31, 2019						December 31, 2018
	Amortization			Accumulated		Net Carrying				Accumulated		Net Carrying
	Period	Cost		Amortization		Amount		Cost		Amortization		Amount
Customer relationships	12 Years	$	928,200	$	(96,687)	$	831,513	$	928,200	$	(19,338)	$	908,862
Content and data	7 Years		154,400		(27,572)		126,828		154,400		(5,514)		148,886
		$	1,082,600	$	(124,259)	$	958,341	$	1,082,600	$	(24,852)	$	1,057,748

Amortization expense relating to intangible assets was $99.4 million year ended December 31, 2019. Amortization expense relating to intangible assets for the 2018 Successor Period and the 2018 Predecessor Period was $24.9 million and $19.6 million, respectively.

The estimated annual future amortization for existing intangible assets through December 31, 2024 is as follows (in thousands):


	Amount
2020	$	99,408
2021	$	99,408
2022	$	99,408
2023	$	99,408
2024	$	99,408