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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Statement [Abstract] |  |  |
Net sales | $ 108,920 | $ 108,994 | $ 103,846
Cost of sales | 73,753 | 75,593 | 71,598
Gross margin | 35,167 | 33,401 | 32,248
Selling, general and administrative expense | 19,593 | 19,430 | 18,641
Other operating income (expense): |  |  |
Insurance recoveries | 443 | 3,657 | 10,368
Other income, net | 9 | 120 | 186
Corporate expense | (17,009) | (17,480) | (21,323)
Income (loss) from operations | (983) | 268 | 2,838
Equity in earnings (losses) of Kronos Worldwide, Inc. | 13,171 | (52,770) | 30,161
Other income (expense): |  |  |
Securities transactions, net |  | 3 | 16
Interest and dividends | 1,732 | 1,172 | 1,618
Interest expense | (4) |  |
Income (loss) before taxes | 13,916 | (51,327) | 34,633
Income tax expense (benefit) | (2,777) | (28,611) | 5,003
Net income (loss) | 16,693 | (22,716) | 29,630
Noncontrolling interest in net income of subsidiary | 1,368 | 1,193 | 1,131
Net income (loss) attributable to NL stockholders | $ 15,325 | $ (23,909) | $ 28,499
Amounts attributable to NL stockholders: |  |  |
Basic and diluted net income (loss) per share | $ 0.31 | $ (0.49) | $ 0.59
Weighted average shares used in the calculation of net income (loss) per share | 48,701 | 48,688 | 48,679

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