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Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill
The carrying amount of goodwill at September 30, 2020 and December 31, 2019 was $2.7 billion.
Intangible Assets
Intangible assets with an indefinite useful life consisted of the following at September 30, 2020 and December 31, 2019 (in thousands):
Amount
Licenses
$168,800 
Tradename
154,300 
Total
$323,100 
Intangible assets that are subject to amortization consisted of the following at September 30, 2020 and December 31, 2019 (in thousands):
September 30, 2020December 31, 2019
Amortization
Period
Cost
Accumulated
Amortization
Net Carrying
Amount
Cost
Accumulated
Amortization
Net Carrying
Amount
Customer relationships
12 years$928,200 $(154,700)$773,500 $928,200 $(96,687)$831,513 
Content and data
7 years154,400 (44,114)110,286 154,400 (27,572)126,828 
$1,082,600 $(198,814)$883,786 $1,082,600 $(124,259)$958,341 
Amortization expense for definite-lived intangible assets was $24.9 million for each of the three months ended September 30, 2020 and 2019, respectively, and $74.6 million for each of the nine months ended September 30, 2020 and 2019.