Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, Net

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Intangible Assets, Net
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net Intangible Assets, Net 
Intangible assets, net consisted of the following:

  March 31, 2024 December 31, 2023
  Gross   Net Gross   Net
  Carrying Accumulated Carrying Carrying Accumulated Carrying
  Amount Amortization Amount Amount Amortization Amount
(in thousands)
Customer lists $ 595,400  $ (328,293) $ 267,107  $ 604,080  $ (327,042) $ 277,038 
Proprietary technologies 90,058  (38,476) 51,582  93,058  (37,052) 56,006 
Trade names 11,000  (6,363) 4,637  15,700  (10,676) 5,024 
Total intangible assets $ 696,458  $ (373,132) $ 323,326  $ 712,838  $ (374,770) $ 338,068 

During the three months ended March 31, 2024 and 2023, the Company retired fully amortized intangible assets with historical costs of $16.4 million and $17.5 million, respectively.
The estimated future amortization expense of the Company's intangible assets as of March 31, 2024 was as follows (in thousands):

Remainder of 2024 $ 42,626 
2025 53,973 
2026 46,448 
2027 37,672 
2028 30,296 
Thereafter 112,311 
Total $ 323,326