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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, 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.