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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Sales $ 359,238 $ 376,704
Costs, expenses and other:    
Costs of goods sold 321,320 313,896
Selling, general and administrative expenses 19,213 16,770
Other non-operating expense (income), net 3,546 1,797
Costs, expenses and other 344,079 332,463
Income before taxes 15,159 44,241
Income taxes 3,566 16,948
Net income $ 11,593 $ 27,293
Earnings per common share    
Basic (in dollars per share) $ 0.38 $ 0.90
Diluted (in dollars per share) $ 0.37 $ 0.88
Weighted average common shares outstanding    
Basic (in shares) 30,488,601 30,482,966
Diluted (in shares) 31,285,365 30,894,254