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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, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 535,759	$ 536,504
Accumulated Amortization	(232,608)	(214,521)
Total	303,151	321,983
Software for resale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	130,737	130,261
Accumulated Amortization	(127,237)	(123,418)
Total	3,500	6,843
Software for internal use
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	445,343	430,330
Accumulated Amortization	(267,970)	(240,717)
Total	177,373	189,613
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	576,080	560,591
Accumulated Amortization	(395,207)	(364,135)
Total	180,873	196,456
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	511,710	512,389
Accumulated Amortization	(214,845)	(197,787)
Total	296,865	314,602
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,049	24,115
Accumulated Amortization	(17,763)	(16,734)
Total	$ 6,286	$ 7,381

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
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-Topic 350
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB
-Name Accounting Standards Codification
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