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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Net sales | $ 342,029 | $ 341,159 | $ 324,705
Cost of sales | (91,037) | (90,937) | (85,345)
Gross profit | 250,992 | 250,222 | 239,360
Operating expenses: |  |  |
Volume incentives | 119,970 | 119,910 | 117,786
Selling, general and administrative | 129,635 | 120,273 | 107,702
Operating income | 1,387 | 10,039 | 13,872
Other income (expense): |  |  |
Interest and other income, net | 144 | 591 | 1,486
Interest expense | (289) | (16) | (130)
Foreign exchange gains (losses), net | 1,980 | (1,348) | (1,948)
Other income (expense), net | 1,835 | (773) | (592)
Income from continuing operations before provision for income taxes | 3,222 | 9,266 | 13,280
Provision for income taxes | 17,039 | 8,591 | 1,740
Net income (loss) from continuing operations | (13,817) | 675 | 11,540
Income from discontinued operations | 0 | 0 | 2,116
Net income (loss) | (13,817) | 675 | 13,656
Net loss attributable to noncontrolling interests | (875) | (1,464) | (1,031)
Net income (loss) attributable to common shareholders | $ (12,942) | $ 2,139 | $ 14,687
Basic earnings (loss) per share attributable to common shareholders: |  |  |
Net income (loss) from continuing operations (in dollars per share) | $ (0.69) | $ 0.11 | $ 0.67
Income from discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.11
Net Income (loss) per common share attributable to shareholders (in dollars per share) | (0.69) | 0.11 | 0.79
Diluted earnings (loss) per share attributable to common shareholders: |  |  |
Net income (loss) from continuing operations (in dollars per share) | (0.69) | 0.11 | 0.66
Income from discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.11
Net Income (loss) per common share attributable to shareholders (in dollars per share) | $ (0.69) | $ 0.11 | $ 0.77
Weighted average basic common shares outstanding (in shares) | 18,882 | 18,731 | 18,656
Weighted average diluted common shares outstanding (in shares) | 18,882 | 19,056 | 19,177
Dividends declared per common share (in dollars per share) | $ 0.10 | $ 0.4 | $ 0.4

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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