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Intangible Assets
9 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
8. Intangible Assets
Goodwill, customer relationships and trademarks consist of the following amounts (in thousands):
September 30, 2022December 31, 2021
Goodwill$120,343 $120,343 
Customer relationships—Acquired
Cost$5,026 $46,552 
Accumulated amortization(4,524)(41,120)
Customer relationshipsAcquired
$502 $5,432 
Customer relationships—Other
Cost$7,886 $15,955 
Accumulated amortization(3,353)(7,204)
Customer relationshipsOther, net
$4,533 $8,751 
Trademarks
Cost$4,041 $7,040 
Accumulated amortization(1,111)(3,508)
Trademarks, net$2,930 $3,532 

Changes in goodwill, customer relationships and trademarks consisted of the following (in thousands):
Goodwill
Customer Relationships Acquired
Customer Relationships Other
Trademarks
Balance at December 31, 2021$120,343 $5,432 $8,751 $3,532 
Additions — — 1,092 — 
Amortization — (4,930)(5,310)(602)
Balance at September 30, 2022$120,343 $502 $4,533 $2,930 

During the nine months ended September 30, 2022, the Company changed the estimated average life for Customer Relationships – Other from three years to eighteen months, resulting in approximately $0.9 million of additional amortization recorded in the nine months ended September 30, 2022.

Estimated future amortization expense for customer relationships and trademarks at September 30, 2022 is as follows (in thousands):
Year ending December 31,
2022 (remaining three months)$2,139 
20232,921 
2024746 
2025543 
2026
404 
> 5 years1,212 
Total$7,965