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Intangible Assets
 9 Months Ended
Sep. 30, 2022
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets Intangible Assets
 
The gross amount, accumulated amortization and net carrying amount of intangible assets were as follows:
 
  September 30, 2022December 31, 2021
 Useful Life
(Years)
Gross
Amount
Accumulated
Amortization
Net
Carrying
Amount
Gross
Amount
Accumulated
Amortization
Net
Carrying
Amount
Customer relationships
5-18
$107,525 $(80,938)$26,587 $112,109 $(80,319)$31,790 
Software/Technology
3-15
50,093 (27,554)22,539 52,265 (26,415)25,850 
Covenants not to compete
2-5
12,441 (12,336)105 12,623 (12,390)233 
Other
2-12
10,294 (9,188)1,106 10,574 (9,066)1,508 
Total $180,353 $(130,016)$50,337 $187,571 $(128,190)$59,381 
 
Amortization expense for the three months ended September 30, 2022 and 2021 was $2.3 million and $2.4 million, respectively.

Amortization expense for the nine months ended September 30, 2022 and September 30, 2021 was $6.9 million and $7.3 million, respectively.