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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, 2017   11,779,978    
Balance at Dec. 31, 2017 $ 601,649 $ 0 $ (145,994) $ 747,643
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 234,734     234,734
Other comprehensive income (loss) (35,322)   (35,322)  
Cash dividends (80,448)     (80,448)
Repurchases of common stock (in shares)   (603,449)    
Repurchases of common stock (232,016) $ (2,038)   (229,978)
Tax withholdings related to stock-based compensation (in shares)   (2,055)    
Tax withholdings related to stock-based compensation (740)   (740)
Stock-based compensation (in shares)   10,008    
Stock-based compensation 2,050 $ 2,038   12
Balance (in shares) at Dec. 31, 2018   11,184,482    
Balance at Dec. 31, 2018 489,907 $ 0 (181,316) 671,223
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 254,286     254,286
Other comprehensive income (loss) 18,568   18,568  
Cash dividends (81,676)     (81,676)
Tax withholdings related to stock-based compensation (in shares)   (603)    
Tax withholdings related to stock-based compensation (304) $ (304)  
Stock-based compensation (in shares)   4,670    
Stock-based compensation $ 2,317 $ 2,269   48
Balance (in shares) at Dec. 31, 2019 11,188,549 11,188,549    
Balance at Dec. 31, 2019 $ 683,098 $ 1,965 (162,748) 843,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 270,568     270,568
Other comprehensive income (loss) (10,416)   (10,416)  
Cash dividends (83,417)     (83,417)
Repurchases of common stock (in shares)   (270,963)    
Repurchases of common stock (101,434) $ (2,630)   (98,804)
Tax withholdings related to stock-based compensation (in shares)   (1,547)    
Tax withholdings related to stock-based compensation (641) $ (641)  
Stock-based compensation (in shares)   5,338    
Stock-based compensation $ 2,066 $ 2,023   43
Balance (in shares) at Dec. 31, 2020 10,921,377 10,921,377    
Balance at Dec. 31, 2020 $ 759,824 $ 717 $ (173,164) $ 932,271