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Software and Other Intangible Assets
 3 Months Ended
Mar. 31, 2025
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):
March 31, 2025December 31, 2024
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Software for internal use$490,497 $(406,759)$83,738 $488,257 $(395,364)$92,893 
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 March 31, 2025 and 2024, totaled $15.6 million and $15.5 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):
March 31, 2025December 31, 2024
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Customer relationships$447,001 $(286,285)$160,716 $444,385 $(279,008)$165,377 

Other intangible assets amortization expense recorded during the three months ended March 31, 2025 and 2024, totaled $5.2 million and $8.5 million, respectively.

Based on capitalized intangible assets as of March 31, 2025, 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 2025$40,022 $15,751 
202629,967 21,001 
202710,883 20,737 
20282,636 18,338 
2029230 17,721 
Thereafter— 67,168 
Total$83,738 $160,716