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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net sales |  | $ 429,590 |  | $ 456,976 |  | $ 452,917 |  | $ 375,598 |  | $ 308,166 |  | $ 331,442 |  | $ 356,195 |  | $ 334,893 |  | $ 1,715,081 |  | $ 1,330,696 |  | $ 1,055,116
Operating income (a) |  | 1,774 | [1] | 18,614 | [1] | 24,319 | [1] | 12,345 | [1] | (1,984) | [2] | 5,286 | [2] | 9,633 | [2] | 11,051 | [2] | 57,052 | [1] | 23,986 | [2] | 5,748
Income (loss) before income taxes |  | (1,512) |  | 15,708 |  | 21,556 |  | 10,313 |  | (4,164) |  | 3,298 |  | 7,817 |  | 9,399 |  | 46,065 |  | 16,350 |  |
Net income (loss) |  | $ (1,316) | [3] | $ 11,599 | [3] | $ 15,848 | [3] | $ 7,629 | [3] | $ 4,187 | [3] | $ 2,280 | [3] | $ 4,797 | [3] | $ 7,699 | [3] | $ 33,759 | [3] | $ 18,963 | [3] | $ (1,078)
Basic net income (loss) per share (in dollars per share) |  | $ (0.11) |  | $ 1.01 |  | $ 1.39 |  | $ 0.67 |  | $ 0.37 |  | $ 0.20 |  | $ 0.42 |  | $ 0.68 |  | $ 2.95 |  | $ 1.67 |  | $ (0.10)
Weighted average shares outstanding - basic (in shares) |  | 11,444 |  | 11,444 |  | 11,435 |  | 11,418 |  | 11,389 |  | 11,386 |  | 11,383 |  | 11,369 |  | 11,432 |  | 11,381 |  | 11,210
Diluted net income (loss) per share (in dollars per share) |  | $ (0.11) |  | $ 1.01 |  | $ 1.39 |  | $ 0.67 |  | $ 0.37 |  | $ 0.20 |  | $ 0.42 |  | $ 0.68 |  | $ 2.95 |  | $ 1.67 |  | $ (0.10)
Weighted average shares outstanding - diluted (in shares) |  | 11,444 |  | 11,446 |  | 11,435 |  | 11,418 |  | 11,391 |  | 11,386 |  | 11,390 |  | 11,369 |  | 11,440 |  | 11,381 |  | 11,210
Market price of common stock: (c) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 429,590 |  | $ 456,976 |  | $ 452,917 |  | $ 375,598 |  | $ 308,166 |  | $ 331,442 |  | $ 356,195 |  | $ 334,893 |  | $ 1,715,081 |  | $ 1,330,696 |  | $ 1,055,116
Operating income (a) |  | 1,774 | [1] | 18,614 | [1] | 24,319 | [1] | 12,345 | [1] | (1,984) | [2] | 5,286 | [2] | 9,633 | [2] | 11,051 | [2] | 57,052 | [1] | 23,986 | [2] | 5,748
Income (loss) before income taxes |  | (1,512) |  | 15,708 |  | 21,556 |  | 10,313 |  | (4,164) |  | 3,298 |  | 7,817 |  | 9,399 |  | 46,065 |  | 16,350 |  |
Net income (loss) |  | $ (1,316) | [3] | $ 11,599 | [3] | $ 15,848 | [3] | $ 7,629 | [3] | $ 4,187 | [3] | $ 2,280 | [3] | $ 4,797 | [3] | $ 7,699 | [3] | $ 33,759 | [3] | $ 18,963 | [3] | $ (1,078)
Basic net income (loss) per share (in dollars per share) |  | $ (0.11) |  | $ 1.01 |  | $ 1.39 |  | $ 0.67 |  | $ 0.37 |  | $ 0.20 |  | $ 0.42 |  | $ 0.68 |  | $ 2.95 |  | $ 1.67 |  | $ (0.10)
Weighted average shares outstanding - basic (in shares) |  | 11,444 |  | 11,444 |  | 11,435 |  | 11,418 |  | 11,389 |  | 11,386 |  | 11,383 |  | 11,369 |  | 11,432 |  | 11,381 |  | 11,210
Diluted net income (loss) per share (in dollars per share) |  | $ (0.11) |  | $ 1.01 |  | $ 1.39 |  | $ 0.67 |  | $ 0.37 |  | $ 0.20 |  | $ 0.42 |  | $ 0.68 |  | $ 2.95 |  | $ 1.67 |  | $ (0.10)
Weighted average shares outstanding - diluted (in shares) |  | 11,444 |  | 11,446 |  | 11,435 |  | 11,418 |  | 11,391 |  | 11,386 |  | 11,390 |  | 11,369 |  | 11,440 |  | 11,381 |  | 11,210
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock: (c) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (in dollars per share) | [4] | $ 21.41 |  | $ 24.23 |  | $ 24.27 |  | $ 25.84 |  | $ 22.86 |  | $ 22.44 |  | $ 24 |  | $ 27.93 |  | $ 25.84 |  | $ 27.93 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock: (c) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (in dollars per share) | [4] | $ 13.72 |  | $ 19.92 |  | $ 19.75 |  | $ 19.75 |  | $ 18.10 |  | $ 16.58 |  | $ 15.83 |  | $ 18.05 |  | $ 13.72 |  | $ 15.83 |  |
[1] | Operating income (loss) in 2018 includes $8,408 of LIFO expense related to the Company's tubular and pipe products segment.
[2] | Operating income (loss) in 2017 includes $2,707 of LIFO expense 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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