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Software and Other Intangible Assets
 3 Months Ended
Mar. 31, 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):
March 31, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Software for internal use$481,471 $(369,103)$112,368 $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 March 31, 2024 and 2023, totaled $15.5 million and $17.0 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):
March 31, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Customer relationships$446,207 $(259,698)$186,509 $447,654 $(252,828)$194,826 
Trademarks and trade names21,810 (21,537)273 21,899 (21,079)820 
Total other intangible assets$468,017 $(281,235)$186,782 $469,553 $(273,907)$195,646 

Other intangible assets amortization expense recorded during the three months ended March 31, 2024 and 2023, totaled $8.5 million and $8.4 million, respectively.

Based on capitalized intangible assets as of March 31, 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$44,011 $20,980 
202541,082 20,989 
202620,922 20,989 
20274,842 20,711 
20281,509 18,309 
Thereafter2 84,804 
Total$112,368 $186,782