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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sales    
Sales $ 1,821,316 $ 1,170,534
Costs and expenses    
Materials, labor, and other operating expenses (excluding depreciation) 1,450,434 992,270
Depreciation and amortization 19,539 35,332
Selling and distribution expenses 120,917 99,463
General and administrative expenses 25,262 16,084
Loss on curtailment of facility 0 1,669
Other (income) expense, net (97) 169
Total costs and expenses 1,616,055 1,144,987
Income from operations 205,261 25,547
Foreign currency exchange gain (loss) 154 (873)
Pension expense (excluding service costs) (19) (387)
Interest expense (5,875) (6,421)
Interest income 59 655
Change in fair value of interest rate swaps 1,024 (2,314)
Total nonoperating income (expense) (4,657) (9,340)
Income before income taxes 200,604 16,207
Income tax provision (51,448) (4,007)
Net income $ 149,156 $ 12,200
Weighted average common shares outstanding:    
Basic (in shares) 39,355 39,163
Diluted (in shares) 39,630 39,405
Net income per common share:    
Basic (in dollars per share) $ 3.79 $ 0.31
Diluted (in dollars per share) 3.76 0.31
Dividends declared per common share $ 0.10 $ 0.10