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Retirement and Security Bonus Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Retirement and Security Bonus Plans
Cash surrender value in life insurance of certain employees	$ 7,900
Total liability	123,150	$ 133,882
Current liabilities	72,244	97,995
Security bonus plan | Certain Canadian Employees
Retirement and Security Bonus Plans
Expense recognized	300	200
Security bonus plan | Certain Sales, Office and Warehouse Employees
Retirement and Security Bonus Plans
Expense recognized	200	200
Deferred Bonus
Retirement and Security Bonus Plans
Expense recognized	$ 200	300
Initial vesting percentage	25.00%
Minimum vesting period (in years)	5 years
Annual vesting percentage after initial period (as a percent)	5.00%
Total liability	$ 10,900
Current liabilities	300
Long-term liabilities	10,600
Postemployment Retirement Benefits
Retirement and Security Bonus Plans
401k Employer matching contributions	$ 3,500	$ 2,900

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