Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, Net

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

  June 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  $ (335,834) $ 257,366  $ 604,080  $ (327,042) $ 277,038 
Proprietary technologies 89,857  (39,605) 50,252  93,058  (37,052) 56,006 
Trade names 11,000  (6,750) 4,250  15,700  (10,676) 5,024 
Total intangible assets $ 694,057  $ (382,189) $ 311,868  $ 712,838  $ (374,770) $ 338,068 

During the six months ended June 30, 2024 and 2023, the Company retired fully amortized intangible assets with historical costs of $21.8 million and $17.5 million, respectively.

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

Remainder of 2024 $ 28,595 
2025 54,573 
2026 47,048 
2027 38,272 
2028 30,896 
Thereafter 112,484 
Total $ 311,868