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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Net sales $ 27,107 $ 28,918 $ 54,182 $ 56,808
Cost of sales 18,621 19,758 37,491 39,082
Gross margin 8,486 9,160 16,691 17,726
Selling, general and administrative expense 4,769 4,854 9,621 9,719
Other operating income (expense):        
Insurance recoveries 233 233 323 3,367
Other income 5 17 5 17
Corporate expense (3,334) (5,656) (8,983) (9,487)
Income (loss) from operations 621 (1,100) (1,585) 1,904
Equity in earnings (losses) of Kronos Worldwide, Inc. 497 (48,589) (653) (42,984)
Other income - interest and dividend income 377 282 730 584
Income (loss) before income taxes 1,495 (49,407) (1,508) (40,496)
Income tax provision (benefit) 330 (20,507) (492) (21,953)
Net income (loss) 1,165 (28,900) (1,016) (18,543)
Noncontrolling interest in net income of subsidiary 320 367 608 682
Net income (loss) attributable to NL stockholders $ 845 $ (29,267) $ (1,624) $ (19,225)
Amounts attributable to NL stockholders:        
Basic and diluted net income (loss) per share $ 0.02 $ (0.60) $ (0.03) $ (0.39)
Weighted average shares used in the calculation of net income (loss) per share 48,699 48,687 48,695 48,685