Quarterly report pursuant to Section 13 or 15(d)

Changes in Equity - Changes in Equity (Details)

v3.22.2.2
Changes in Equity - Changes in Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
May 03, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance   $ 645,281 $ 727,876 $ 651,711 $ 547,177 $ 513,935 $ 485,184 $ 651,711 $ 485,184
Beginning balance, treasury stock (in shares)       11,461       11,461  
Net income   129,837 118,894 $ 97,900 83,837 57,046 50,052 $ 346,631 190,935
Share-based compensation, net of forfeitures   2,091 1,811 1,481          
Conversion of Sub-shares into shares of common stock             0    
Periodic pension costs, net of income taxes   8 8 8 29 29 28 24 86
Repurchases of common stock   (32,915) (25,534)   (8,689) (2,504)      
Ending balance   $ 721,170 645,281 $ 727,876 $ 601,042 $ 547,177 $ 513,935 $ 721,170 $ 601,042
Ending balance, treasury stock (in shares)   47,311           47,311  
Dividend paid per common stock (in USD per share)   $ 3.00   $ 3.00 $ 2.75   $ 2.75 $ 29.00 $ 8.25
Other comprehensive income - periodic pension costs   $ 3 $ 2 $ 2 $ 8   $ 8 $ 8 $ 23
Common Stock                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance (in shares)   7,727,916 7,745,290 7,744,695 7,754,523 7,756,156 0 7,744,695 0
Beginning balance   $ 78 $ 78 $ 78 $ 78 $ 78 $ 0 $ 78 $ 0
Share-based compensation, net of forfeitures (in shares)     104 595          
Conversion of sub-shares into shares of common stock (in shares)             7,756,156    
Conversion of Sub-shares into shares of common stock             $ 78    
Repurchases of common stock (in shares)   (19,071) (17,478)   (6,179) (1,633)      
Ending balance (in shares)   7,708,845 7,727,916 7,745,290 7,748,344 7,754,523 7,756,156 7,708,845 7,748,344
Ending balance   $ 78 $ 78 $ 78 $ 78 $ 78 $ 78 $ 78 $ 78
Sub-share Certificates                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance (in shares)         0 0 7,756,156   7,756,156
Conversion of sub-shares into shares of common stock (in shares)             7,756,156    
Ending balance (in shares)         0 0 0   0
Treasury Stock                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance   $ (40,011) $ (14,617) $ (15,417) $ (2,504) $ 0 $ 0 $ (15,417) $ 0
Beginning balance, treasury stock (in shares)   28,240 10,866 11,461 1,633 0 0 11,461 0
Share-based compensation, forfeitures (in shares)     (104) (595)          
Share-based compensation, net of forfeitures     $ 140 $ 800          
Repurchases of common stock (in shares)   19,071 17,478   6,179 1,633      
Repurchases of common stock   $ (32,915) $ (25,534)   $ (8,689) $ (2,504)      
Ending balance   $ (72,926) $ (40,011) $ (14,617) $ (11,193) $ (2,504) $ 0 $ (72,926) $ (11,193)
Ending balance, treasury stock (in shares)   47,311 28,240 10,866 7,812 1,633 0 47,311 7,812
Additional Paid-in Capital                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance   $ 3,356 $ 1,505 $ 28       $ 28  
Share-based compensation, net of forfeitures   2,121 1,851 1,477          
Ending balance   5,477 3,356 1,505       5,477  
Accum. Other Comp. Inc/(Loss)                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance   (991) (999) (1,007) $ (2,636) $ (2,665) $ (2,693) (1,007) $ (2,693)
Periodic pension costs, net of income taxes   8 8 8 29 29 28    
Ending balance   (983) (991) (999) (2,607) (2,636) (2,665) (983) (2,607)
Retained Earnings                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance   682,849 741,909 668,029 552,239 516,522 0 668,029 0
Net income   129,837 118,894 97,900 83,837 57,046 50,052    
Share-based compensation, net of forfeitures   (30) (180) (796)          
Conversion of Sub-shares into shares of common stock             487,799    
Ending balance   789,524 682,849 741,909 614,764 552,239 516,522 $ 789,524 614,764
Net Proceeds From All Sources                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance         0 0 487,877   487,877
Conversion of Sub-shares into shares of common stock             (487,877)    
Ending balance         0 0 0   $ 0
Dividend Paid                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Dividends paid   $ (23,132) $ (23,188) (23,224) $ (21,312) $ (21,329) (21,329)    
Dividend paid per common stock (in USD per share)   $ 3.00 $ 3.00   $ 2.75 $ 2.75      
Dividend Paid | Retained Earnings                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Dividends paid   $ (23,132) $ (23,188) $ (23,224) $ (21,312) $ (21,329) $ (21,329)    
Special Dividend Paid                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Dividends paid     (154,586)            
Dividend paid per common stock (in USD per share) $ 20.00                
Special Dividend Paid | Retained Earnings                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Dividends paid     $ (154,586)