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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Capital in Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive Loss
Total
Balance at Dec. 31, 2022 $ 21,661   $ 856,013 $ (19,939) $ 857,735
Balance (in shares) at Dec. 31, 2022 216,609,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 115 $ 1,687     1,802
Stock issued for stock incentive plans, net (in shares) 1,149,000        
Stock purchased and retired $ (139) (1,687) (9,523)   (11,349)
Stock purchased and retired (in shares) (1,388,000)        
Net income     71,524   71,524
Cash dividends ($0.04 per share)     (8,679)   (8,679)
Pension adjustment, net of taxes       16,678 16,678
Foreign currency translation       (16) (16)
Balance at Mar. 31, 2023 $ 21,637   909,335 (3,277) 927,695
Balance (in shares) at Mar. 31, 2023 216,370,000        
Balance at Dec. 31, 2022 $ 21,661   856,013 (19,939) 857,735
Balance (in shares) at Dec. 31, 2022 216,609,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income         154,854
Foreign currency translation         322
Balance at Sep. 30, 2023 $ 21,623   978,496 (2,363) 997,756
Balance (in shares) at Sep. 30, 2023 216,228,000        
Balance at Mar. 31, 2023 $ 21,637   909,335 (3,277) 927,695
Balance (in shares) at Mar. 31, 2023 216,370,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 4 2,312     2,316
Stock issued for stock incentive plans, net (in shares) 40,000        
Stock purchased and retired   (2,312) 2,310   (2)
Stock purchased and retired (in shares) (1,000)        
Net income     65,013   65,013
Cash dividends ($0.04 per share)     (8,635)   (8,635)
Pension adjustment, net of taxes       576 576
Foreign currency translation       439 439
Balance at Jun. 30, 2023 $ 21,641   968,023 (2,262) 987,402
Balance (in shares) at Jun. 30, 2023 216,409,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ (4) 1,919     1,915
Stock issued for stock incentive plans, net (in shares) (44,000)        
Stock purchased and retired $ (14) (1,919) 790   (1,143)
Stock purchased and retired (in shares) (137,000)        
Net income     18,317   18,317
Cash dividends ($0.04 per share)     (8,634)    
Foreign currency translation       (101) (101)
Balance at Sep. 30, 2023 $ 21,623   978,496 (2,363) 997,756
Balance (in shares) at Sep. 30, 2023 216,228,000        
Balance at Dec. 31, 2023 $ 21,502   1,003,380 (2,369) $ 1,022,513
Balance (in shares) at Dec. 31, 2023 215,026,000       215,026,458
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 65 1,861     $ 1,926
Stock issued for stock incentive plans, net (in shares) 652,000        
Stock purchased and retired $ (133) (1,861) (7,888)   (9,882)
Stock purchased and retired (in shares) (1,331,000)        
Net income     27,467   27,467
Cash dividends ($0.04 per share)     (8,621)   (8,621)
Foreign currency translation       (113) (113)
Balance at Mar. 31, 2024 $ 21,434   1,014,338 (2,482) 1,033,290
Balance (in shares) at Mar. 31, 2024 214,347,000        
Balance at Dec. 31, 2023 $ 21,502   1,003,380 (2,369) $ 1,022,513
Balance (in shares) at Dec. 31, 2023 215,026,000       215,026,458
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income         $ 78,682
Foreign currency translation         (105)
Balance at Sep. 30, 2024 $ 21,497   1,053,318 (2,474) $ 1,072,341
Balance (in shares) at Sep. 30, 2024 214,972,000       214,972,351
Balance at Mar. 31, 2024 $ 21,434   1,014,338 (2,482) $ 1,033,290
Balance (in shares) at Mar. 31, 2024 214,347,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ 67 2,615     2,682
Stock issued for stock incentive plans, net (in shares) 662,000        
Stock purchased and retired   (2,615) 2,615    
Net income     32,419   32,419
Cash dividends ($0.04 per share)     (8,582)   (8,582)
Foreign currency translation       (53) (53)
Balance at Jun. 30, 2024 $ 21,501   1,040,790 (2,535) 1,059,756
Balance (in shares) at Jun. 30, 2024 215,009,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net $ (3) 2,382     2,379
Stock issued for stock incentive plans, net (in shares) (28,000)        
Stock purchased and retired $ (1) $ (2,382) 2,313   (70)
Stock purchased and retired (in shares) (9,000)        
Net income     18,796   18,796
Cash dividends ($0.04 per share)     (8,581)   (8,581)
Foreign currency translation       61 61
Balance at Sep. 30, 2024 $ 21,497   $ 1,053,318 $ (2,474) $ 1,072,341
Balance (in shares) at Sep. 30, 2024 214,972,000       214,972,351