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Software and Other Intangible Assets
 6 Months Ended
Jun. 30, 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):
June 30, 2025December 31, 2024
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Software for internal use$499,381 $(410,807)$88,574 $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 June 30, 2025 and 2024, totaled $15.6 million and $15.8 million, respectively. Software for internal use amortization expense recorded during the six months ended June 30, 2025 and 2024, totaled $31.2 million and $31.3 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):
June 30, 2025December 31, 2024
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Customer relationships$452,282 $(295,744)$156,538 $444,385 $(279,008)$165,377 
Other intangible assets amortization expense recorded during the three months ended June 30, 2025 and 2024, totaled $5.3 million and $8.2 million, respectively. Other intangible assets amortization expense recorded during the six months ended June 30, 2025 and 2024, totaled $10.5 million and $16.7 million, respectively.

Based on capitalized intangible assets as of June 30, 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$29,685 $10,596 
202636,636 21,193 
202716,929 20,922 
20285,030 18,522 
2029286 17,904 
Thereafter8 67,401 
Total$88,574 $156,538