Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, Net

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Intangible Assets, Net
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net Intangible Assets, Net 
Intangible assets, net consisted of the following:

  September 30, 2024 December 31, 2023
  Gross   Net Gross   Net
  Carrying Accumulated Carrying Carrying Accumulated Carrying
  Amount Amortization Amount Amount Amortization Amount
(in thousands)
Customer lists $ 593,200  $ (345,423) $ 247,777  $ 604,080  $ (327,042) $ 277,038 
Proprietary technologies 93,956  (44,166) 49,790  93,058  (37,052) 56,006 
Trade names 11,000  (7,141) 3,859  15,700  (10,676) 5,024 
Total intangible assets $ 698,156  $ (396,730) $ 301,426  $ 712,838  $ (374,770) $ 338,068 

During the nine months ended September 30, 2024 and 2023, the Company retired fully amortized intangible assets with historical costs of $21.8 million and $40.5 million, respectively.

The estimated future amortization expense of the Company's intangible assets as of September 30, 2024 was as follows (in thousands):

Remainder of 2024 $ 14,466 
2025 55,393 
2026 47,868 
2027 39,092 
2028 31,716 
Thereafter 112,891 
Total $ 301,426