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Consolidated Statements of Shareholders' Equity (USD $)
In Thousands, unless otherwise specified
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, 2010 $ 552,442 $ 544 $ 48,145 $ 749,453 $ (121,247) $ (124,453)
Net income 42,694     42,694    
Other comprehensive income (loss) (45,494)       (45,494)  
Comprehensive income (loss) (2,800)          
Tax effect on exercise of stock awards 90   90      
Cash dividends declared ($0.36, $0.36 and 0.40 per share at 2011, 2012 and 2013 respectively) (16,322)     (16,322)    
Share-based compensation expense 3,633   3,633      
Repurchase of common shares (48,904)         (48,904)
Delivery of treasury shares            
RSUs     (215)     215
401 (k) plans 1,967   (141)     2,108
Director compensation 164   (13)     177
Employee stock options exercised - net 134   (22)     156
Ending Balance at Dec. 31, 2011 490,404 544 51,477 775,825 (166,741) (170,701)
Net income 59,379     59,379    
Other comprehensive income (loss) 2,775       2,775  
Comprehensive income (loss) 62,154          
Tax effect on exercise of stock awards 631   631      
Cash dividends declared ($0.36, $0.36 and 0.40 per share at 2011, 2012 and 2013 respectively) (15,611)     (15,611)    
Share-based compensation expense 3,970   3,970      
Repurchase of common shares (5,675)         (5,675)
Delivery of treasury shares            
RSUs (337)   (1,433)     1,096
401 (k) plans 2,446   234     2,212
Employee stock options exercised - net 1,697   (2,387)     4,084
Ending 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 (loss) 88,609       88,609  
Comprehensive income (loss) 155,767          
Tax effect on exercise of stock awards 1,451   1,451      
Cash dividends declared ($0.36, $0.36 and 0.40 per share at 2011, 2012 and 2013 respectively) (17,422)     (17,422)    
Share-based compensation expense 4,473   4,473      
Delivery of treasury shares            
RSUs (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)