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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Sales $ 368,653 $ 366,660 $ 1,128,350 $ 1,104,805
Costs, expenses and other:        
Costs of goods sold 343,434 309,408 1,007,712 922,604
Selling, general and administrative expenses 18,057 19,050 55,189 53,914
Other non-operating expense (income), net 1,453 2,390 6,581 7,153
Total costs, expenses and other 362,944 330,848 1,069,482 983,671
Income before taxes 5,709 35,812 58,868 121,134
Income taxes 229 14,538 13,385 46,803
Net income $ 5,480 $ 21,274 $ 45,483 $ 74,331
Earnings per common share        
Basic (in dollars per share) $ 0.18 $ 0.70 $ 1.50 $ 2.44
Diluted (in dollars per share) $ 0.18 $ 0.68 $ 1.46 $ 2.40
Weighted average common shares outstanding        
Basic (in shares) 30,160,991 30,482,966 30,375,873 30,482,966
Diluted (in shares) 30,983,834 31,159,710 31,189,640 31,013,606