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Consolidated Statements Of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock and Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Balance (in shares) at Dec. 31, 2020   10,921,377    
Balance at Dec. 31, 2020 $ 759,824 $ 717 $ (173,164) $ 932,271
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 173,702     173,702
Other comprehensive income (loss) 790   790  
Cash dividends (64,116)     (64,116)
Repurchases of common stock (in shares)   (292,392)    
Repurchases of common stock (99,460) $ (2,748)   (96,712)
Stock-based compensation dividend forfeitures       2
Stock-based compensation (in shares)   8,062    
Stock-based compensation 2,033 $ 2,031    
Balance (in shares) at Sep. 30, 2021   10,637,047    
Balance at Sep. 30, 2021 772,773 $ 0 (172,374) 945,147
Balance (in shares) at Jun. 30, 2021   10,928,129    
Balance at Jun. 30, 2021 849,210 $ 1,748 (164,947) 1,012,409
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 52,038     52,038
Other comprehensive income (loss) (7,427)   (7,427)  
Cash dividends (22,590)     (22,590)
Repurchases of common stock (in shares)   (292,392)    
Repurchases of common stock (99,460) $ (2,748)   (96,712)
Stock-based compensation dividend forfeitures       2
Stock-based compensation (in shares)   1,310    
Stock-based compensation 1,002 $ 1,000    
Balance (in shares) at Sep. 30, 2021   10,637,047    
Balance at Sep. 30, 2021 $ 772,773 $ 0 (172,374) 945,147
Balance (in shares) at Dec. 31, 2021 10,362,722 10,362,722    
Balance at Dec. 31, 2021 $ 762,129 $ 0 (82,227) 844,356
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 189,016     189,016
Other comprehensive income (loss) (66,402)   (66,402)  
Cash dividends (63,790)     (63,790)
Repurchases of common stock (in shares)   (499,275)    
Repurchases of common stock (155,185) $ (1,573)   (153,612)
Stock-based compensation dividend forfeitures       35
Stock-based compensation (in shares)   7,993    
Stock-based compensation $ 1,608 $ 1,573    
Balance (in shares) at Sep. 30, 2022 9,871,440 9,871,440    
Balance at Sep. 30, 2022 $ 667,376 $ 0 (148,629) 816,005
Balance (in shares) at Jun. 30, 2022   10,079,643    
Balance at Jun. 30, 2022 721,335 $ 0 (114,413) 835,748
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 63,226     63,226
Other comprehensive income (loss) (34,216)   (34,216)  
Cash dividends (20,930)     (20,930)
Repurchases of common stock (in shares)   (209,538)    
Repurchases of common stock (62,340) $ (298)   (62,042)
Stock-based compensation dividend forfeitures       3
Stock-based compensation (in shares)   1,335    
Stock-based compensation $ 301 $ 298    
Balance (in shares) at Sep. 30, 2022 9,871,440 9,871,440    
Balance at Sep. 30, 2022 $ 667,376 $ 0 $ (148,629) $ 816,005