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PROPERTY, EQUIPMENT AND SOFTWARE, NET - Depreciation and Amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization of property, equipment and software | $ 77,792 | $ 91,410 | $ 101,330
Selling, general and administrative |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization of property, equipment and software | 39,915 | 56,027 | 64,761
Service | Cost of revenue |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization of property, equipment and software | 28,443 | 28,917 | 28,102
Product | Cost of revenue |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization of property, equipment and software | $ 9,434 | $ 6,466 | $ 8,467

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