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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues $ 1,040,930 $ 827,098 $ 974,579
Costs and expenses:      
Cost of goods sold 687,781 682,066 707,645
Selling, general and administrative expenses 72,519 57,925 59,861
Gain on sale of facility   (9,176)  
Deltic merger-related costs [1]     22,119
Total costs and expenses 760,300 730,815 789,625
Operating income 280,630 96,283 184,954
Interest expense, net [2] (29,463) (30,361) (35,227)
Loss on extinguishment of debt   (5,512)  
Pension settlement charge (42,988)    
Non-operating pension and other postretirement employee benefit costs (14,226) (3,739) (7,648)
Income before income taxes 193,953 56,671 142,079
Income taxes (27,123) (1,010) (19,199)
Net income $ 166,830 $ 55,661 $ 122,880
Net income per share:      
Basic (in dollars per share) $ 2.48 $ 0.82 $ 2.03
Diluted (in dollars per share) 2.47 0.82 1.99
Dividends/Special distribution per share $ 1.61 $ 1.60 $ 1.60
Weighted-average shares outstanding (in thousands)      
Basic (in shares) 67,237 67,608 60,534
Diluted (in shares) 67,568 67,743 61,814
Deltic [Member]      
Costs and expenses:      
Deltic merger-related costs     $ 22,100
Net income per share:      
Dividends/Special distribution per share     $ 3.54
[1] See Note 2: Mergers and Divestitures.
[2] Includes amortization of bond discounts and deferred loan fees.