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Software and Other Intangible Assets
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Software and Other Intangible Assets Software and Other Intangible Assets
The carrying amount and accumulated amortization of the Company's software assets subject to amortization at each balance sheet date are as follows (in thousands):
September 30, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Software for internal use$478,291 $(387,978)$90,313 $469,325 $(360,907)$108,418 

Amortization of software for internal use is computed using the straight-line method over an estimated useful life of generally three to eight years. Software for internal use amortization expense recorded during the three months ended September 30, 2024 and 2023, totaled $16.6 million and $16.3 million, respectively. Software for internal use amortization expense recorded during the nine months ended September 30, 2024 and 2023, totaled $47.9 million and $49.3 million, respectively. These software amortization expense amounts are reflected in depreciation and amortization in the condensed consolidated statements of operations.

The carrying amount and accumulated amortization of the Company’s other intangible assets subject to amortization at each balance sheet date are as follows (in thousands):
September 30, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Customer relationships$450,398 $(278,088)$172,310 $447,654 $(252,828)$194,826 
Trademarks and trade names22,065 (22,065)— 21,899 (21,079)820 
Total other intangible assets$472,463 $(300,153)$172,310 $469,553 $(273,907)$195,646 

Other intangible assets amortization expense recorded during the three months ended September 30, 2024 and 2023, totaled $7.1 million and $8.5 million, respectively. Other intangible assets amortization expense recorded during the nine months ended September 30, 2024 and 2023, totaled $23.8 million and $25.4 million, respectively.

Based on capitalized intangible assets as of September 30, 2024, estimated amortization expense amounts in future fiscal years are as follows (in thousands):
Fiscal Year Ending December 31,Software AmortizationOther Intangible Assets Amortization
Remainder of 2024$14,849 $5,672 
202544,333 21,103 
202623,498 21,103 
20275,929 20,839 
20281,661 18,441 
Thereafter43 85,152 
Total$90,313 $172,310