Quarterly report pursuant to Section 13 or 15(d)

Changes in Equity - Changes in Equity (Details)

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Changes in Equity - Changes in Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 1,043,196 $ 772,887
Net income 114,417 86,568
Issuance of common stock related to stock split 0  
Share-based compensation, net of forfeitures 3,416 2,370
Repurchases of common stock and related excise taxes (10,445) (6,749)
Shares exchanged for tax withholdings (1,207) (939)
Periodic pension costs, net of income taxes (21) (25)
Ending balance $ 1,122,449 $ 829,051
Cash dividends per share of common stock (in dollars per share) $ 1.17 $ 1.08
Periodic pension costs, net of income taxes $ 6 $ 6
Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 23,007,681 23,087,037
Beginning balance $ 78 $ 78
Issuance of common stock related to stock split $ 153  
Share-based compensation, net of forfeitures (in shares) 8,373 5,268
Repurchases of common stock and related excise taxes (in shares) (20,106) (10,881)
Shares exchanged for tax withholdings (in shares) (2,469) (1,464)
Ending balance (in shares) 22,993,479 23,079,960
Ending balance $ 231 $ 78
Treasury Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (144,998) (104,139)
Share-based compensation, net of forfeitures 4,698 3,033
Repurchases of common stock and related excise taxes (10,445) (6,749)
Shares exchanged for tax withholdings (1,207) (939)
Ending balance (151,952) (108,794)
Additional Paid-in Capital    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 14,613 8,293
Issuance of common stock related to stock split (153)  
Share-based compensation, net of forfeitures (1,297) (560)
Ending balance 13,163 7,733
Accum. Other Comp. Income (Loss)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 1,831 2,516
Periodic pension costs, net of income taxes (21) (25)
Ending balance 1,810 2,491
Retained Earnings    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 1,171,672 866,139
Net income 114,417 86,568
Share-based compensation, net of forfeitures 15 (103)
Ending balance 1,259,197 927,543
Dividend Paid    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Dividends paid $ (26,907) $ (25,061)
Cash dividends per share of common stock (in dollars per share) $ 1.17 $ 1.08
Dividend Paid | Retained Earnings    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Dividends paid $ (26,907) $ (25,061)