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Software and Other Intangible Assets
 12 Months Ended
Dec. 31, 2020
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):
December 31, 2020December 31, 2019
Gross Carrying
Amount
Accumulated
Amortization
Net
Balance
Gross Carrying
Amount
Accumulated
Amortization
Net
Balance
Software for resale
$130,261 $(123,418)$6,843 $138,823 $(122,061)$16,762 
Software for internal use
430,330 (240,717)189,613 400,065 (182,310)217,755 
Total software
$560,591 $(364,135)$196,456 $538,888 $(304,371)$234,517 

Software for resale amortization expense recorded during the years ended December 31, 2020, 2019, and 2018, totaled $8.5 million, $11.0 million, and $12.8 million, respectively. These software amortization expense amounts are reflected in cost of revenue in the consolidated statements of operations.

Software for internal use amortization expense recorded during the years ended December 31, 2020, 2019, and 2018, totaled $70.0 million, $55.6 million, and $41.7 million, respectively. These software amortization expense amounts are reflected in depreciation and amortization in the 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):
December 31, 2020December 31, 2019
Gross Carrying
Amount
Accumulated
Amortization
Net
Balance
Gross Carrying
Amount
Accumulated
Amortization
Net
Balance
Customer relationships
$512,389 $(197,787)$314,602 $507,785 $(160,775)$347,010 
Trademarks and trade names
24,115 (16,734)7,381 27,312 (17,353)9,959 
Total other intangible assets
$536,504 $(214,521)$321,983 $535,097 $(178,128)$356,969 

Other intangible assets amortization expense recorded during the years ended December 31, 2020, 2019, and 2018, totaled $37.1 million, $31.9 million, and $19.0 million, respectively.
Based on capitalized intangible assets as of December 31, 2020, estimated amortization expense amounts in future fiscal years are as follows (in thousands):
Fiscal Year Ending December 31,Software
Amortization		Other Intangible
Assets Amortization
2021$67,599 $37,062 
202250,179 36,903 
202332,004 36,564 
202420,608 32,044 
202518,354 23,452 
Thereafter
7,712 155,958 
Total
$196,456 $321,983