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Schedule II Consolidated Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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