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Software and Other Intangible Assets
 6 Months Ended
Jun. 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):
June 30, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Software for internal use$479,657 $(379,457)$100,200 $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 June 30, 2024 and 2023, totaled $15.8 million and $16.0 million, respectively. Software for internal use amortization expense recorded during the six months ended June 30, 2024 and 2023, totaled $31.3 million and $33.0 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, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Customer relationships$446,262 $(267,661)$178,601 $447,654 $(252,828)$194,826 
Trademarks and trade names21,795 (21,795)— 21,899 (21,079)820 
Total other intangible assets$468,057 $(289,456)$178,601 $469,553 $(273,907)$195,646 

Other intangible assets amortization expense recorded during the three months ended June 30, 2024 and 2023, totaled $8.2 million and $8.5 million, respectively. Other intangible assets amortization expense recorded during the six months ended June 30, 2024 and 2023, totaled $16.7 million and $16.9 million, respectively.

Based on capitalized intangible assets as of June 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$29,342 $12,785 
202542,369 20,977 
202621,689 20,977 
20275,281 20,713 
20281,517 18,315 
Thereafter2 84,834 
Total$100,200 $178,601