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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 receivable |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Year | $ 190 | $ 849 | $ 1,087
Provisions | 305 | 83 | (121)
Amounts Written Off | (290) | (714) | (75)
Amounts Recovered | 0 | 0 | 4
Effect of Currency Translation | 0 | (28) | (46)
Balance at End of Year | 205 | 190 | 849
Allowance for sales returns |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Year | 94 | 129 | 135
Provisions | 1,435 | 1,126 | 1,527
Amounts Written Off | (1,368) | (1,155) | (1,525)
Amounts Recovered | 0 | 0 | 0
Effect of Currency Translation | (5) | (6) | (8)
Balance at End of Year | 156 | 94 | 129
Tax valuation allowance |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Year | 6,565 | 13,169 | 11,340
Provisions | 5,638 | (6,088) | 1,829
Amounts Written Off | (493) | 0 | 0
Amounts Recovered | 0 | 0 | 0
Effect of Currency Translation | (460) | (516) | 0
Balance at End of Year | $ 11,250 | $ 6,565 | $ 13,169

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- Definition Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments. + 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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