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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for Bad Debts [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 2,786 $ 2,660 $ 2,137
Charged to costs and expenses 1,611 852 1,485
Deductions (521) (726) (962)
Balance at end of period 3,876 2,786 2,660
Sales Returns and Allowances [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 3,667 3,246 2,219
Charged to costs and expenses 384 518 1,050
Deductions (367) (97) (23)
Balance at end of period 3,684 3,667 3,246
Deferred Tax Asset Valuation Allowance [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 1,732 1,159 570
Charged to costs and expenses 989 573 589
Deductions 0 0 0
Balance at end of period $ 2,721 $ 1,732 $ 1,159