Annual report pursuant to Section 13 and 15(d)

Acquisitions - Pro Forma Information (Details)

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Acquisitions - Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
American Stainless Tubing, Inc.    
Business Acquisition [Line Items]    
Pro-forma net sales $ 316,734  
Pro-forma net income (loss) $ 13,420  
Earnings per share:    
Basic (in dollars per share) $ 1.52  
Diluted (in dollars per share) $ 1.51  
MUSA-Galvanized    
Business Acquisition [Line Items]    
Pro-forma net sales $ 292,793 $ 225,376
Pro-forma net income (loss) $ 11,920 $ 21
Earnings per share:    
Basic (in dollars per share) $ 1.35  
Diluted (in dollars per share) $ 1.34