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Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue Recognition        
Selling, marketing and administrative expenses $ 35,743 $ 32,868 $ 94,930 $ 78,699
Royalty income (as a percent)     0.20%  
Rental income (as a percent)     1.00%  
Shipping and Handling        
Revenue Recognition        
Selling, marketing and administrative expenses $ 17,743 $ 12,356 $ 40,319 $ 31,425