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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Allowance for Doubtful Accounts [Member] |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period |  | $ 395 | $ 350 | $ 350
Additions charged to costs and expenses |  | 418 | 269 | 257
Deductions Describe | [1],[2] | 453 | 224 | 257
Balance at end of period |  | 360 | 395 | 350
Reserve for Cancelled Sales and Allowances [Member] |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period |  | 1,659 | 1,627 | 1,277
Additions charged to costs and expenses |  | 11,402 | 11,466 | 11,126
Deductions Describe | [1],[2] | 11,289 | 11,434 | 10,776
Balance at end of period |  | $ 1,772 | $ 1,659 | $ 1,627
[1] | Allowance for doubtful accounts: uncollectible accounts written off, net of recoveries.
[2] | Reserve for cancelled sales and allowances: impact of sales cancelled after delivery plus amount of allowance given to customers.

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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