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 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 1,122,449 $ 1,043,196 $ 829,051 $ 772,887 $ 1,043,196 $ 772,887
Net income 114,589 114,417 100,393 86,568 229,006 186,961
Issuance of common stock related to stock split   0        
Share-based compensation, net of forfeitures 2,642 3,416 2,806 2,370    
Repurchases of common stock and related excise taxes (6,344) (10,445) (19,708) (6,749)    
Shares exchanged for tax withholdings   (1,207)   (939)    
Periodic pension costs, net of income taxes (21) (21) (26) (25) (42) (51)
Ending balance $ 1,206,421 1,122,449 $ 887,550 $ 829,051 $ 1,206,421 $ 887,550
Cash dividends per share of common stock (in dollars per share) $ 1.17   $ 1.08   $ 2.34 $ 2.16
Periodic pension costs, net of income taxes $ 5 $ 6 $ 8   $ 11 $ 14
Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (in shares) 22,993,479 23,007,681 23,079,960 23,087,037 23,007,681 23,087,037
Beginning balance $ 231 $ 78 $ 78 $ 78 $ 78 $ 78
Issuance of common stock related to stock split   $ 153        
Share-based compensation, net of forfeitures (in shares)   8,373 0 5,268    
Repurchases of common stock and related excise taxes (in shares) (10,087) (20,106) (42,525) (10,881)    
Shares exchanged for tax withholdings (in shares)   (2,469)   (1,464)    
Ending balance (in shares) 22,983,392 22,993,479 23,037,435 23,079,960 22,983,392 23,037,435
Ending balance $ 231 $ 231 $ 78 $ 78 $ 231 $ 78
Treasury Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (151,952) (144,998) (108,794) (104,139) (144,998) (104,139)
Share-based compensation, net of forfeitures   4,698 0 3,033    
Repurchases of common stock and related excise taxes (6,344) (10,445) (19,708) (6,749)    
Shares exchanged for tax withholdings   (1,207)   (939)    
Ending balance (158,296) (151,952) (128,502) (108,794) (158,296) (128,502)
Additional Paid-in Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 13,163 14,613 7,733 8,293 14,613 8,293
Issuance of common stock related to stock split   (153)        
Share-based compensation, net of forfeitures 2,700 (1,297) 2,849 (560)    
Ending balance 15,863 13,163 10,582 7,733 15,863 10,582
Accum. Other Comp. Income (Loss)            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 1,810 1,831 2,491 2,516 1,831 2,516
Periodic pension costs, net of income taxes (21) (21) (26) (25)    
Ending balance 1,789 1,810 2,465 2,491 1,789 2,465
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 1,259,197 1,171,672 927,543 866,139 1,171,672 866,139
Net income 114,589 114,417 100,393 86,568    
Share-based compensation, net of forfeitures (58) 15 (43) (103)    
Ending balance 1,346,834 1,259,197 1,002,927 927,543 $ 1,346,834 $ 1,002,927
Dividend Paid            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends paid (26,894) $ (26,907) $ (24,966) $ (25,061)    
Cash dividends per share of common stock (in dollars per share)   $ 1.17 $ 1.08 $ 1.08    
Dividend Paid | Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends paid $ (26,894) $ (26,907) $ (24,966) $ (25,061)