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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
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.