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Schedule III - Supplemental Financial Information - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net sales |  | $ 308,166 |  | $ 331,442 |  | $ 356,195 |  | $ 334,893 |  | $ 254,904 |  | $ 268,255 |  | $ 273,608 |  | $ 258,349 |  | $ 1,330,696 |  | $ 1,055,116 |  |
Operating income (loss) (a) |  | (1,984) | [1] | 5,286 | [1] | 9,633 | [1] | 11,051 | [1] | (2,653) | [2] | 27 | [2] | 8,339 | [2] | 35 | [2] | 23,986 | [1] | 5,748 | [2] | $ (27,779)
Income (loss) before income taxes |  | (4,164) |  | 3,298 |  | 7,817 |  | 9,399 |  | (4,044) |  | (1,288) |  | 7,007 |  | (1,255) |  | 16,350 |  | 420 |  |
Net income (b) |  | $ 4,187 | [3] | $ 2,280 | [3] | $ 4,797 | [3] | $ 7,699 | [3] | $ (2,104) |  | $ (1,757) |  | $ 3,550 |  | $ (767) |  | $ 18,963 | [3] | $ (1,078) |  | $ (26,777)
Basic net income (loss) per share (in dollars per share) |  | $ 0.37 |  | $ 0.20 |  | $ 0.42 |  | $ 0.68 |  | $ (0.19) |  | $ (0.16) |  | $ 0.32 |  | $ (0.07) |  | $ 1.67 |  | $ (0.10) |  | $ (2.39)
Weighted average shares outstanding - basic (in shares) |  | 11,389 |  | 11,386 |  | 11,383 |  | 11,369 |  | 11,221 |  | 11,219 |  | 11,216 |  | 11,182 |  | 11,381 |  | 11,210 |  | 11,192
Diluted net income (loss) per share (in dollars per share) |  | $ 0.37 |  | $ 0.20 |  | $ 0.42 |  | $ 0.68 |  | $ (0.19) |  | $ (0.16) |  | $ 0.32 |  | $ (0.07) |  | $ 1.67 |  | $ (0.10) |  | $ (2.39)
Weighted average shares outstanding - diluted (in shares) |  | 11,391 |  | 11,386 |  | 11,390 |  | 11,369 |  | 11,221 |  | 11,219 |  | 11,216 |  | 11,182 |  | 11,381 |  | 11,210 |  | 11,192
Market price of common stock: (c) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 308,166 |  | $ 331,442 |  | $ 356,195 |  | $ 334,893 |  | $ 254,904 |  | $ 268,255 |  | $ 273,608 |  | $ 258,349 |  | $ 1,330,696 |  | $ 1,055,116 |  |
Operating income (loss) (a) |  | (1,984) | [1] | 5,286 | [1] | 9,633 | [1] | 11,051 | [1] | (2,653) | [2] | 27 | [2] | 8,339 | [2] | 35 | [2] | 23,986 | [1] | 5,748 | [2] | $ (27,779)
Income (loss) before income taxes |  | (4,164) |  | 3,298 |  | 7,817 |  | 9,399 |  | (4,044) |  | (1,288) |  | 7,007 |  | (1,255) |  | 16,350 |  | 420 |  |
Net income (b) |  | $ 4,187 | [3] | $ 2,280 | [3] | $ 4,797 | [3] | $ 7,699 | [3] | $ (2,104) |  | $ (1,757) |  | $ 3,550 |  | $ (767) |  | $ 18,963 | [3] | $ (1,078) |  | $ (26,777)
Basic net income (loss) per share (in dollars per share) |  | $ 0.37 |  | $ 0.20 |  | $ 0.42 |  | $ 0.68 |  | $ (0.19) |  | $ (0.16) |  | $ 0.32 |  | $ (0.07) |  | $ 1.67 |  | $ (0.10) |  | $ (2.39)
Weighted average shares outstanding - basic (in shares) |  | 11,389 |  | 11,386 |  | 11,383 |  | 11,369 |  | 11,221 |  | 11,219 |  | 11,216 |  | 11,182 |  | 11,381 |  | 11,210 |  | 11,192
Diluted net income (loss) per share (in dollars per share) |  | $ 0.37 |  | $ 0.20 |  | $ 0.42 |  | $ 0.68 |  | $ (0.19) |  | $ (0.16) |  | $ 0.32 |  | $ (0.07) |  | $ 1.67 |  | $ (0.10) |  | $ (2.39)
Weighted average shares outstanding - diluted (in shares) |  | 11,391 |  | 11,386 |  | 11,390 |  | 11,369 |  | 11,221 |  | 11,219 |  | 11,216 |  | 11,182 |  | 11,381 |  | 11,210 |  | 11,192
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock: (c) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (in dollars per share) | [4] | $ 22.86 |  | $ 22.44 |  | $ 24 |  | $ 27.93 |  | $ 28.67 |  | $ 31.19 |  | $ 27.48 |  | $ 17.50 |  | $ 27.93 |  | $ 31.19 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock: (c) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (in dollars per share) | [4] | $ 18.10 |  | $ 16.58 |  | $ 15.83 |  | $ 18.05 |  | $ 17.14 |  | $ 17.42 |  | $ 15.41 |  | $ 7.98 |  | $ 15.83 |  | $ 7.98 |  |
[1] | Operating income (loss) in 2017 includes $2,707 of LIFO expense related to the Company's tubular and pipe products segment.
[2] | Operating income (loss) in 2016 includes $1,489 of LIFO income related to the Company's tubular and pipe products segment.
[3] | Includes a $6.2 million tax benefit related to the U.S. Tax Cuts and Jobs Act.
[4] | Represents the high and low sales prices of our common stock as reported by the Nasdaq Global Select Market.

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