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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Statement [Abstract]        
Sales $ 427,940 $ 583,736 $ 828,484 $ 1,062,809
Costs, expenses and other:        
Costs of goods sold 360,017 476,835 690,059 852,482
Selling, general and administrative expenses 24,011 20,841 49,126 42,051
Interest expense, net 1,954 769 3,221 1,332
Other non-operating (income) expense, net (1,325) 172 (1,433) (431)
Total costs, expenses and other 384,657 498,617 740,973 895,434
Income before taxes 43,283 85,119 87,511 167,375
Income tax expense 10,555 19,962 19,829 39,145
Net income $ 32,728 $ 65,157 $ 67,682 $ 128,230
Earnings per common share        
Basic (in dollars per share) $ 1.19 $ 2.31 $ 2.46 $ 4.55
Diluted (in dollars per share) $ 1.16 $ 2.23 $ 2.39 $ 4.37
Weighted average common shares outstanding        
Basic (in shares) 27,494,555 28,168,207 27,547,874 28,183,951
Diluted (in shares) 28,113,402 29,262,709 28,348,266 29,316,792