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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Inventory Valuation Reserve [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | $ 5,349 | $ 5,316 | $ 6,641
Charged to costs and expenses |  | 4,694 | 3,300 | 5,234
Charged to other accounts - describe | [1] | (183) | 570 | (135)
Deductions - describe | [2] | 5,006 | 3,837 | 6,424
Balance at end of period |  | 4,854 | 5,349 | 5,316
Allowance for Doubtful Accounts [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | 1,821 | 2,011 | 1,823
Charged to costs and expenses |  | 1,441 | 843 | 349
Charged to other accounts - describe | [1] | (91) | 205 | (68)
Deductions - describe | [3] | 569 | 1,238 | 93
Balance at end of period |  | 2,602 | 1,821 | 2,011
Allowance for Sales Returns [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | 3,310 | 3,332 | 4,047
Charged to costs and expenses |  | 1,329 | 3,497 | 3,789
Charged to other accounts - describe | [1] |  |  |
Deductions - describe | [4] | 3,260 | 3,519 | 4,504
Balance at end of period |  | $ 1,379 | $ 3,310 | $ 3,332
[1] | Foreign currency translation adjustment.
[2] | Disposal of inventory.
[3] | Write-off of bad debts.
[4] | Write-off of sales returns.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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