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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Bad Debts [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 2,137 $ 2,031 $ 1,336
Charged to costs and expenses 1,485 1,031 983
Deductions (962) (925) (288)
Balance at end of period 2,660 2,137 2,031
Sales Returns and Allowances [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 2,219 1,817 1,814
Charged to costs and expenses 1,050 424 268
Deductions (23) (22) (265)
Balance at end of period 3,246 2,219 1,817
Deferred Tax Asset Valuation Allowance [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 570 441 124
Charged to costs and expenses 589 129 317
Deductions 0 0 0
Balance at end of period $ 1,159 $ 570 $ 441