v3.25.2
Changes in Equity - Changes in Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 1,206,257 $ 1,132,465 $ 1,122,449 $ 1,043,196 $ 1,132,465 $ 1,043,196
Net income 116,140 120,652 114,589 114,417 236,792 229,006
Issuance of common stock related to stock split       0    
Dividends paid (36,782) (37,434) (26,894) (26,907)    
Share-based compensation, net of forfeitures 3,419 4,873 2,642 3,416    
Repurchases of common stock and related excise taxes     (6,344) (10,445)    
Shares exchanged for tax withholdings (51) (14,260)   (1,207)    
Periodic pension costs, net of income taxes (39) (39) (21) (21) (78) (42)
Ending balance $ 1,288,944 $ 1,206,257 $ 1,206,421 $ 1,122,449 $ 1,288,944 $ 1,206,421
Dividends accrued per common stock (in dollars per share) $ 1.60 $ 1.60 $ 1.17 $ 1.17 $ 3.20 $ 2.34
Amortization of net actuarial costs and prior service costs, income taxes $ 10 $ 11 $ 5 $ 6 $ 21 $ 11
Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (in shares) 22,987,245 22,971,803 22,993,479 23,007,681 22,971,803 23,007,681
Beginning balance $ 231 $ 231 $ 231 $ 78 $ 231 $ 78
Issuance of common stock related to stock split       $ 153    
Share-based compensation, net of forfeitures (in shares) 119 25,890   8,373    
Repurchases of common stock and related excise taxes (in shares)     (10,087) (20,106)    
Shares exchanged for tax withholdings (in shares) (38) (10,448)   (2,469)    
Ending balance (in shares) 22,987,326 22,987,245 22,983,392 22,993,479 22,987,326 22,983,392
Ending balance $ 231 $ 231 $ 231 $ 231 $ 231 $ 231
Treasury Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (144,850) (168,843) (151,952) (144,998) (168,843) (144,998)
Share-based compensation, net of forfeitures 174 38,253   4,698    
Repurchases of common stock and related excise taxes     (6,344) (10,445)    
Shares exchanged for tax withholdings (51) (14,260)   (1,207)    
Ending balance (144,727) (144,850) (158,296) (151,952) (144,727) (158,296)
Additional Paid-in Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 2,122 19,900 13,163 14,613 19,900 14,613
Issuance of common stock related to stock split       (153)    
Share-based compensation, net of forfeitures 3,311 (17,778) 2,700 (1,297)    
Ending balance 5,433 2,122 15,863 13,163 5,433 15,863
Accum. Other Comp. Income (Loss)            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 3,544 3,583 1,810 1,831 3,583 1,831
Periodic pension costs, net of income taxes (39) (39) (21) (21)    
Ending balance 3,505 3,544 1,789 1,810 3,505 1,789
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 1,345,210 1,277,594 1,259,197 1,171,672 1,277,594 1,171,672
Net income 116,140 120,652 114,589 114,417    
Dividends paid (36,782) (37,434) (26,894) (26,907)    
Share-based compensation, net of forfeitures (66) (15,602) (58) 15    
Ending balance $ 1,424,502 $ 1,345,210 $ 1,346,834 $ 1,259,197 $ 1,424,502 $ 1,346,834