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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Bad Debts [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 2,660 $ 2,137 $ 2,031
Charged to costs and expenses 852 1,485 1,031
Deductions (726) (962) (925)
Balance at end of period 2,786 2,660 2,137
Sales Returns and Allowances [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 3,246 2,219 1,817
Charged to costs and expenses 518 1,050 424
Deductions (97) (23) (22)
Balance at end of period 3,667 3,246 2,219
Deferred Tax Asset Valuation Allowance [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 1,159 570 441
Charged to costs and expenses 573 589 129
Deductions 0 0 0
Balance at end of period $ 1,732 $ 1,159 $ 570