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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Sales $ 345,215 $ 400,459 $ 660,110 $ 759,697
Costs, expenses and other:        
Costs of goods sold 303,128 342,958 570,008 664,278
Selling, general and administrative expenses 20,009 17,919 39,422 37,132
Other non-operating expense (income), net 1,452 1,582 3,056 5,128
Total costs, expenses and other 324,589 362,459 612,486 706,538
Income before taxes 20,626 38,000 47,624 53,159
Income tax expense 5,280 9,590 12,104 13,156
Net income $ 15,346 $ 28,410 $ 35,520 $ 40,003
Earnings per common share        
Basic (in dollars per share) $ 0.54 $ 0.93 $ 1.25 $ 1.31
Diluted (in dollars per share) $ 0.53 $ 0.91 $ 1.21 $ 1.28
Weighted average common shares outstanding        
Basic (in shares) 28,162,007 30,481,627 28,489,486 30,485,095
Diluted (in shares) 29,136,979 31,305,168 29,460,149 31,294,323