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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, 2016   11,845,972    
Balance at Dec. 31, 2016 $ 483,251 $ 1,603 $ (182,510) $ 664,158
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 186,437     186,437
Other comprehensive income (loss) 18,590   18,590  
Cash dividends (62,227)     (62,227)
Stock-based compensation (in shares)   7,135    
Stock-based compensation 2,399 $ 2,396   3
Balance (in shares) at Sep. 30, 2017   11,853,107    
Balance at Sep. 30, 2017 $ 628,450 $ 3,999 (163,920) 788,371
Balance (in shares) at Dec. 31, 2017 11,779,978 11,779,978    
Balance at Dec. 31, 2017 $ 601,649 $ 0 (145,994) 747,643
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 171,931     171,931
Other comprehensive income (loss) (2,459)   (2,459)  
Cash dividends (60,778)     (60,778)
Repurchases of common stock (in shares)   (385,181)    
Repurchases of common stock (148,649) $ (2,366)   (146,283)
Stock-based compensation (in shares)   9,234    
Stock-based compensation $ 2,378 $ 2,366   12
Balance (in shares) at Sep. 30, 2018 11,404,031 11,404,031    
Balance at Sep. 30, 2018 $ 564,072 $ 0 $ (148,453) $ 712,525