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Software and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Carrying Amount and Accumulated Amortization of 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, 2021December 31, 2020
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Software for resale$130,737 $(127,237)$3,500 $130,261 $(123,418)$6,843 
Software for internal use445,343 (267,970)177,373 430,330 (240,717)189,613 
Total software$576,080 $(395,207)$180,873 $560,591 $(364,135)$196,456 
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, 2021December 31, 2020
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Customer relationships$511,710 $(214,845)$296,865 $512,389 $(197,787)$314,602 
Trademarks and trade names24,049 (17,763)6,286 24,115 (16,734)7,381 
Total other intangible assets$535,759 $(232,608)$303,151 $536,504 $(214,521)$321,983 
Schedule of Estimated Intangible Asset Amortization Expense in Future Fiscal Years Based on capitalized intangible assets as of June 30, 2021, 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 2021$36,132 $18,518 
202256,235 36,881 
202338,403 36,551 
202423,197 32,016 
202519,123 23,398 
Thereafter7,783 155,787 
Total$180,873 $303,151