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Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Payables and Accruals [Abstract] |  |
Accrued Sales Incentive and Advertising, Current | $ 41,188 | $ 41,991
Accrued Vacation, Current | 42,783 | 36,595
Dividends Payable, Current | 15,693 | 10,210
Other Employee-related Liabilities, Current | 16,832 | 10,175
Other Accrued Liabilities, Current | 9,999 | 10,146
Accrued profit sharing trust contributions | $ 10,152 | $ 9,047
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:AccruedLiabilitiesCurrent | us-gaap:AccruedLiabilitiesCurrent
Operating Lease, Liability, Current | $ 9,143 | $ 7,392
Accrued liabilities | $ 145,790 | $ 125,556

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