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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net sales |  | $ 331,547 |  | $ 299,921 |  | $ 248,296 |  | $ 354,380 |  | $ 319,740 |  | $ 384,230 |  | $ 429,151 |  | $ 445,919 |  | $ 1,234,144 |  | $ 1,579,040 |  | $ 1,715,081
Operating income (loss) (a) |  | 5,370 | [1] | (363) | [1] | (7,485) | [1] | 3,051 | [1] | 1,015 | [2] | 3,581 | [2] | 5,940 | [2] | 6,074 | [2] | 573 | [1] | 16,610 | [2] | 57,052
Income (loss) before income taxes |  | 3,777 |  | (2,081) |  | (9,402) |  | 795 |  | (1,288) |  | 1,024 |  | 2,707 |  | 2,846 |  | (6,911) |  | 5,289 |  |
Net income (loss) |  | $ 1,786 |  | $ (1,520) |  | $ (6,454) |  | $ 593 |  | $ (890) |  | $ 591 |  | $ 2,081 |  | $ 2,074 |  | $ (5,595) |  | $ 3,856 |  | $ 33,759
Basic net income (loss) per share (in dollars per share) |  | $ 0.16 |  | $ (0.13) |  | $ (0.56) |  | $ 0.05 |  | $ (0.08) |  | $ 0.05 |  | $ 0.18 |  | $ 0.18 |  | $ (0.49) |  | $ 0.34 |  | $ 2.95
Weighted average shares outstanding - basic (in shares) |  | 11,451 |  | 11,452 |  | 11,446 |  | 11,444 |  | 11,416 |  | 11,420 |  | 11,415 |  | 11,488 |  | 11,447 |  | 11,509 |  | 11,432
Diluted net income (loss) per share (in dollars per share) |  | $ 0.16 |  | $ (0.13) |  | $ (0.56) |  | $ 0.05 |  | $ (0.08) |  | $ 0.05 |  | $ 0.18 |  | $ 0.18 |  | $ (0.49) |  | $ 0.34 |  | $ 2.95
Weighted average shares outstanding - diluted (in shares) |  | 11,475 |  | 11,452 |  | 11,446 |  | 11,459 |  | 11,416 |  | 11,420 |  | 11,415 |  | 11,488 |  | 11,447 |  | 11,509 |  | 11,440
Market price of common stock: (b) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 331,547 |  | $ 299,921 |  | $ 248,296 |  | $ 354,380 |  | $ 319,740 |  | $ 384,230 |  | $ 429,151 |  | $ 445,919 |  | $ 1,234,144 |  | $ 1,579,040 |  | $ 1,715,081
Operating income (loss) (a) |  | 5,370 | [1] | (363) | [1] | (7,485) | [1] | 3,051 | [1] | 1,015 | [2] | 3,581 | [2] | 5,940 | [2] | 6,074 | [2] | 573 | [1] | 16,610 | [2] | 57,052
Income (loss) before income taxes |  | 3,777 |  | (2,081) |  | (9,402) |  | 795 |  | (1,288) |  | 1,024 |  | 2,707 |  | 2,846 |  | (6,911) |  | 5,289 |  |
Net income (loss) |  | $ 1,786 |  | $ (1,520) |  | $ (6,454) |  | $ 593 |  | $ (890) |  | $ 591 |  | $ 2,081 |  | $ 2,074 |  | $ (5,595) |  | $ 3,856 |  | $ 33,759
Basic net income (loss) per share (in dollars per share) |  | $ 0.16 |  | $ (0.13) |  | $ (0.56) |  | $ 0.05 |  | $ (0.08) |  | $ 0.05 |  | $ 0.18 |  | $ 0.18 |  | $ (0.49) |  | $ 0.34 |  | $ 2.95
Weighted average shares outstanding - basic (in shares) |  | 11,451 |  | 11,452 |  | 11,446 |  | 11,444 |  | 11,416 |  | 11,420 |  | 11,415 |  | 11,488 |  | 11,447 |  | 11,509 |  | 11,432
Diluted net income (loss) per share (in dollars per share) |  | $ 0.16 |  | $ (0.13) |  | $ (0.56) |  | $ 0.05 |  | $ (0.08) |  | $ 0.05 |  | $ 0.18 |  | $ 0.18 |  | $ (0.49) |  | $ 0.34 |  | $ 2.95
Weighted average shares outstanding - diluted (in shares) |  | 11,475 |  | 11,452 |  | 11,446 |  | 11,459 |  | 11,416 |  | 11,420 |  | 11,415 |  | 11,488 |  | 11,447 |  | 11,509 |  | 11,440
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock: (b) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (in dollars per share) | [3] | $ 16.49 |  | $ 12.64 |  | $ 13.95 |  | $ 18.05 |  | $ 18.41 |  | $ 16.28 |  | $ 18.24 |  | $ 20.24 |  | $ 18.05 |  | $ 20.24 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock: (b) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (in dollars per share) | [3] | $ 10.84 |  | $ 9.68 |  | $ 7.74 |  | $ 8.44 |  | $ 13.53 |  | $ 9.99 |  | $ 12.09 |  | $ 14.00 |  | $ 7.74 |  | $ 9.99 |  |
[1] | Operating income (loss) in 2020 includes $1,517 of LIFO income related to the Company's tubular and pipe products segment.
[2] | Operating income (loss) in 2019 includes $3,669 of LIFO income related to the Company's tubular and pipe products segment.
[3] | Represents the high and low sales prices of our common stock as reported by the Nasdaq Global Select Market.

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