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Basis of Presentation and Summary of Significant Accounting Policies - Summary of Capitalized Software (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Gross amounts capitalized for internal-use computer software (including construction-in-process) | $ 58,881 | $ 74,432 | $ 46,382
Amounts expensed for amortization of internal-use computer software | $ 72,363 | $ 57,821 | $ 38,632

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