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Intangible Assets
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consist of the following (in thousands):
December 31,
20232022
Customer relationships$501,831 $338,755 
Other43,319 8,540 
545,150 347,295 
Accumulated amortization(175,463)(142,297)
Intangible assets, net$369,687 $204,998 
During 2023, 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 2023, 2022 and 2021 was $36,231,000, $32,892,000 and $32,045,000, respectively.
Future amortization expense for the remaining unamortized balance as of December 31, 2023 is estimated as follows (in thousands):
Years Ending December 31,
Amortization
Expense
2024$59,644 
202559,343 
202657,804 
202737,690 
202836,264 
Thereafter118,942 
Total amortization expense$369,687