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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, 2013   13,099,356    
Balance at Dec. 31, 2013 $ 572,448 $ 0 $ (60,086) $ 632,534
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 233,255     233,255
Other comprehensive income (loss) (79,074)   (79,074)  
Cash dividends (59,400)     (59,400)
Repurchases of common stock (in shares)   (664,254)    
Repurchases of common stock (248,509) $ (2,312)   (246,197)
Stock-based compensation (in shares)   11,263    
Stock-based compensation 2,321 $ 2,312   9
Balance (in shares) at Dec. 31, 2014   12,446,365    
Balance at Dec. 31, 2014 421,041 $ 0 (139,160) 560,201
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 238,603     238,603
Other comprehensive income (loss) (5,366)   (5,366)  
Cash dividends (70,763)     (70,763)
Repurchases of common stock (in shares)   (501,261)    
Repurchases of common stock (197,851) $ (3,070)   (194,781)
Tax benefit from stock-based compensation 374 $ 374    
Tax withholdings related to stock-based compensation (in shares)   (3,135)    
Tax withholdings related to stock-based compensation (1,199) $ (3)   (1,196)
Stock-based compensation (in shares)   6,477    
Stock-based compensation $ 2,725 $ 2,699   26
Balance (in shares) at Dec. 31, 2015 11,948,446 11,948,446    
Balance at Dec. 31, 2015 $ 387,564 $ 0 (144,526) 532,090
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 243,441     243,441
Other comprehensive income (loss) (37,984)   (37,984)  
Cash dividends (75,829)     (75,829)
Repurchases of common stock (in shares)   (98,867)    
Repurchases of common stock (35,815) $ (252)   (35,563)
Tax withholdings related to stock-based compensation (in shares)   (2,582)    
Tax withholdings related to stock-based compensation (1,076) $ (1,076)   0
Stock-based compensation (in shares)   (1,025)    
Stock-based compensation $ 2,950 $ 2,931   19
Balance (in shares) at Dec. 31, 2016 11,845,972 11,845,972    
Balance at Dec. 31, 2016 $ 483,251 $ 1,603 $ (182,510) $ 664,158