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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, 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 63,947     63,947
Other comprehensive income (loss) (24,307)   (24,307)  
Cash dividends (17,421)     (17,421)
Repurchases of common stock (in shares)   (2,629)    
Repurchases of common stock (1,042) $ (232)   (810)
Stock-based compensation (in shares)   (495)    
Stock-based compensation 672 $ 658   14
Balance (in shares) at Mar. 31, 2015   12,443,241    
Balance at Mar. 31, 2015 $ 442,890 $ 426 (163,467) 605,931
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 61,931     61,931
Other comprehensive income (loss) (4,261)   (4,261)  
Cash dividends (18,959)     (18,959)
Repurchases of common stock (in shares)   (98,867)    
Repurchases of common stock (35,815) $ (252)   (35,563)
Stock-based compensation (in shares)   (630)    
Stock-based compensation $ 688 $ 680   8
Balance (in shares) at Mar. 31, 2016 11,848,949 11,848,949    
Balance at Mar. 31, 2016 $ 391,148 $ 428 $ (148,787) $ 539,507