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Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Earnings Per Share, Basic | $ 3.35 | $ (0.19) | $ 0.03
Net sales | $ 305,907 | $ 276,573 | $ 275,834
Cost of goods sold | 122,889 | 108,511 | 106,710
Gross profit | 183,018 | 168,062 | 169,124
Operating expenses: |  |  |
Selling Expense | 98,025 | 92,908 | 90,093
General and Administrative Expense | 80,479 | 76,611 | 75,979
Selling, general and administrative expenses | 178,504 | 169,519 | 166,072
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property | (5,422) | 0 | 0
Environmental remediation expense | 0 | 0 | 931
Operating expenses | 173,082 | 169,519 | 167,003
Operating income (loss) | 9,936 | (1,457) | 2,121
Interest expense | (622) | (496) | (766)
Other income (expenses), net | 780 | 422 | (203)
Income (loss) before income taxes | (10,094) | 1,531 | (1,152)
Income tax (benefit) expense | (19,594) | 98 | 855
Net Income (loss) | $ 29,688 | $ (1,629) | $ 297
Earnings Per Share, Diluted | $ 3.25 | $ (0.19) | $ 0.03
Weighted Average Number of Shares Outstanding, Basic | 8,864 | 8,780 | 8,726
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 267 | 0 | 150
Weighted Average Number of Shares Outstanding, Diluted | 9,131 | 8,780 | 8,876
Comprehensive income (loss) |  |  |
Net income (loss) | $ 29,688 | $ (1,629) | $ 297
Other comprehensive loss, net of tax: |  |  |
Adjustment for foreign currency translation | 861 | 427 | (1,892)
Comprehensive income (loss) | $ 30,549 | $ (1,202) | $ (1,595)

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