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Summary of Significant Accounting Policies, Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accrued Expenses [Abstract] |  |
Accrued sales force commissions and other payments | $ 103,532 | $ 128,022
Accrued income taxes | 0 | 6,674
Accrued other taxes | 29,657 | 38,693
Accrued payroll and other employee expenses | 30,610 | 68,155
Accrued payable to vendors | 34,760 | 34,539
Short-term lease liability | 39,349 | 0
Accrued royalties | 514 | 3,899
Sales return reserve | 3,903 | 3,577
Deferred revenue | 20,162 | 20,104
Other | 27,794 | 18,920
Total accrued expenses | $ 290,281 | $ 322,583

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