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Other Current Liabilities - Allowance for sales discounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Current Liabilities      
Balance at beginning of year $ 809 $ 896 $ 494
Charges to earnings 13,632 8,791 6,448
Amounts utilized (12,871) (8,878) (6,046)
Balance at end of year $ 1,570 $ 809 $ 896