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Valuation and Qualifying Accounts [Schedule] Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 9,681 $ 7,855 $ 6,190
Charged to costs and expenses 15,792 6,926 5,503
Deductions (8,460) (5,100) (3,838)
Balance at end of period 17,013 9,681 7,855
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 1,333 1,496 1,158
Charged to costs and expenses 4,512 536 786
Deductions (1,221) (699) (448)
Balance at end of period 4,624 1,333 1,496
Reserve for sales returns and allowances      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 8,348 6,359 5,032
Charged to costs and expenses 11,280 6,390 4,717
Deductions (7,239) (4,401) (3,390)
Balance at end of period $ 12,389 $ 8,348 $ 6,359