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Summary of Significant Accounting Policies, Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accrued Expenses [Abstract] |  |
Accrued sales force commissions and other payments | $ 149,481 | $ 103,532
Accrued income taxes | 13,921 | 0
Accrued other taxes | 45,018 | 29,657
Accrued payroll and other employee expenses | 65,272 | 30,610
Accrued payable to vendors | 47,201 | 34,760
Short-term operating lease liability | 44,981 | 39,349
Accrued royalties | 1,008 | 514
Sales return reserve | 3,978 | 3,903
Deferred revenue | 35,054 | 20,162
Other | 40,768 | 27,794
Total accrued expenses | $ 446,682 | $ 290,281
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