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Software and Other Intangible Assets - Summary of Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 529,890 | $ 535,097
Accumulated Amortization | (194,193) | (178,128)
Total | 335,697 | 356,969
Software for resale |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 136,618 | 138,823
Accumulated Amortization | (124,271) | (122,061)
Total | 12,347 | 16,762
Software for internal use |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 415,690 | 400,065
Accumulated Amortization | (211,750) | (182,310)
Total | 203,940 | 217,755
Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 552,308 | 538,888
Accumulated Amortization | (336,021) | (304,371)
Total | 216,287 | 234,517
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 502,748 | 507,785
Accumulated Amortization | (175,681) | (160,775)
Total | 327,067 | 347,010
Trademarks and tradenames |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,142 | 27,312
Accumulated Amortization | (18,512) | (17,353)
Total | $ 8,630 | $ 9,959

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