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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Capital in Excess of Par Value [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock [Member]
Beginning Balance at Dec. 31, 2012 $ 539,679 $ 544 $ 52,492 $ 819,593 $ (163,966) $ (168,984)
Net income 67,158     67,158    
Other comprehensive income 88,609       88,609  
Comprehensive income (loss) 155,767          
Tax effect on exercise of stock awards 1,451   1,451      
Cash dividends declared (17,422)     (17,422)    
Share-based compensation expense 4,473   4,473      
Delivery of treasury shares            
RSUs and PSAs (529)   (1,763)     1,234
401 (k) plans 2,890   1,099     1,791
Employee stock options exercised - net (1,833)   (3,812)     1,979
Ending Balance at Dec. 31, 2013 684,476 544 53,940 869,329 (75,357) (163,980)
Net income 69,246     69,246    
Other comprehensive income (79,513)       (79,513)  
Comprehensive income (loss) (10,267)          
Tax effect on exercise of stock awards (14)   (14)      
Cash dividends declared (19,107)     (19,107)    
Share-based compensation expense 4,738   4,738      
Repurchase of common shares (12,180)         (12,180)
Delivery of treasury shares            
RSUs and PSAs (1,758)   (4,121)     2,363
401 (k) plans 3,093   1,318     1,775
Employee stock options exercised - net 128   (1,519)     1,647
Ending Balance at Dec. 31, 2014 649,109 544 54,342 919,468 (154,870) (170,375)
Net income 64,575     64,575    
Other comprehensive income (35,616)       (35,616)  
Comprehensive income (loss) 28,959          
Tax effect on exercise of stock awards 843   843      
Cash dividends declared (20,900)     (20,900)    
Share-based compensation expense 4,403   4,403      
Delivery of treasury shares            
RSUs and PSAs (1,976)   (5,078)     3,102
401 (k) plans 2,848   838     2,010
Employee stock options exercised - net (39)   (436)     397
Ending Balance at Dec. 31, 2015 $ 663,247 $ 544 $ 54,912 $ 963,143 $ (190,486) $ (164,866)