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Schedule II Consolidated Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances and Reserves, Balance, Beginning Balance $ 177 $ 1,041
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense 1,216 1,490
Valuation Allowances and Reserves, Deductions (125) (2,354)
Valuation Allowances and Reserves, Balance, Ending Balance 1,268 177
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances and Reserves, Balance, Beginning Balance 480 471
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense (25) 46
Valuation Allowances and Reserves, Deductions (34) (37)
Valuation Allowances and Reserves, Balance, Ending Balance 421 480
Allowance for Discounts and Returns [Member]    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances and Reserves, Balance, Beginning Balance 1,425 1,934
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense 21,435 17,979
Valuation Allowances and Reserves, Deductions (21,260) (18,488)
Valuation Allowances and Reserves, Balance, Ending Balance $ 1,600 $ 1,425