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Intangible Assets
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consist of the following (in thousands):
December 31,
20222021
Customer relationships$338,755 $320,323 
Other8,540 5,374 
347,295 325,697 
Accumulated amortization(142,297)(110,909)
Intangible assets, net$204,998 $214,788 
During 2022, we periodically assessed whether any indicators of impairment existed related to our intangible assets. As of each interim period end during the year, we concluded that a triggering event had not occurred that would more likely than not reduce the fair value of our intangible assets below their carrying values.
Amortization expense recognized in 2022, 2021 and 2020 was $32,892,000, $32,045,000 and $37,535,000, respectively.
Future amortization expense for the remaining unamortized balance as of December 31, 2022 is estimated as follows (in thousands):
Years Ending December 31,
Amortization
Expense
2023$32,413 
202430,743 
202530,434 
202630,434 
202720,850 
Thereafter60,124 
Total amortization expense$204,998