Quarterly report [Sections 13 or 15(d)]

Changes in Equity - Changes in Equity (Details)

v3.26.1
Changes in Equity - Changes in Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 1,458,907 $ 1,132,465
Net income 142,902 120,652
Regular dividends paid and accrued (41,796) (37,434)
Share-based compensation, net of forfeitures 5,355 4,873
Shares exchanged for tax withholdings (9,063) (14,260)
Periodic pension costs, net of income taxes (359) (39)
Ending balance $ 1,555,946 $ 1,206,257
Dividends accrued per common stock (in dollars per share) $ 0.60 $ 0.53
Amortization of net actuarial costs and prior service costs, income taxes $ 95 $ 11
Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 68,938,230 68,915,409
Beginning balance $ 691 $ 231
Share-based compensation, net of forfeitures (in shares) 57,967 77,670
Shares exchanged for tax withholdings (in shares) (22,010) (31,344)
Ending balance (in shares) 68,974,187 68,961,735
Ending balance $ 691 $ 231
Treasury Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (151,242) (168,843)
Share-based compensation, net of forfeitures 27,397 38,253
Shares exchanged for tax withholdings (9,063) (14,260)
Ending balance (132,908) (144,850)
Additional Paid-in Capital    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 9,906 19,900
Share-based compensation, net of forfeitures (6,997) (17,778)
Ending balance 2,909 2,122
Accum. Other Comp. Income (Loss)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 4,150 3,583
Periodic pension costs, net of income taxes (359) (39)
Ending balance 3,791 3,544
Retained Earnings    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 1,595,402 1,277,594
Net income 142,902 120,652
Regular dividends paid and accrued (41,796) (37,434)
Share-based compensation, net of forfeitures (15,045) (15,602)
Ending balance $ 1,681,463 $ 1,345,210