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Software and Other Intangible Assets
 3 Months Ended
Mar. 31, 2022
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, 2022December 31, 2021
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Software for internal use$443,487 $(296,535)$146,952 $440,242 $(283,109)$157,133 
Software for resale126,934 (126,934)— 127,904 (127,255)649 
Total software$570,421 $(423,469)$146,952 $568,146 $(410,364)$157,782 
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, 2022 and 2021, totaled $16.7 million and $16.9 million, respectively. These software amortization expense amounts are reflected in depreciation and amortization in the condensed consolidated statements of operations.

Amortization of software for resale is computed using the greater of (a) the ratio of current gross revenues to the total of current and future gross revenues expected to be derived from the software or (b) the straight-line method over the remaining estimated useful life of generally five to ten years. Software for resale amortization expense recorded during the three months ended March 31, 2022 and 2021, totaled $0.7 million and $2.0 million, respectively. These software amortization expense amounts are reflected in cost of revenue 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, 2022December 31, 2021
Gross Carrying AmountAccumulated AmortizationNet BalanceGross Carrying AmountAccumulated AmortizationNet Balance
Customer relationships$507,264 $(238,384)$268,880 $507,962 $(230,152)$277,810 
Trademarks and trade names23,701 (19,054)4,647 23,839 (18,645)5,194 
Total other intangible assets$530,965 $(257,438)$273,527 $531,801 $(248,797)$283,004 

Other intangible assets amortization expense recorded during both the three months ended March 31, 2022 and 2021, totaled $9.2 million and $9.3 million, respectively.
Based on capitalized intangible assets as of March 31, 2022, 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 2022$46,543 $27,385 
202344,509 36,231 
202427,692 31,754 
202520,353 23,232 
20267,801 23,232 
Thereafter54 131,693 
Total$146,952 $273,527