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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Sales    
Sales $ 1,544,329 $ 2,326,282
Costs and expenses    
Materials, labor, and other operating expenses (excluding depreciation) 1,230,635 1,729,896
Depreciation and amortization 31,186 20,543
Selling and distribution expenses 128,788 146,651
General and administrative expenses 26,463 26,052
Other (income) expense, net (345) (2,488)
Total costs and expenses 1,416,727 1,920,654
Income from operations 127,602 405,628
Foreign currency exchange gain (loss) (73) 132
Pension expense (excluding service costs) (41) (171)
Interest expense (6,361) (6,254)
Interest income 9,685 65
Change in fair value of interest rate swaps (804) 2,066
Total nonoperating income (expense) 2,406 (4,162)
Income before income taxes 130,008 401,466
Income tax provision (33,275) (98,866)
Net income $ 96,733 $ 302,600
Weighted average common shares outstanding:    
Basic (in shares) 39,593 39,474
Diluted (in shares) 39,838 39,768
Net income per common share:    
Basic (in dollars per share) $ 2.44 $ 7.67
Diluted (in dollars per share) 2.43 7.61
Dividends declared per common share $ 0.15 $ 0.12