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Condensed Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
Beginning balance at Dec. 31, 2011 $ 714,814 $ 479,973 $ 193,372 $ 41,469
Beginning balance, shares at Dec. 31, 2011   104,482    
Exercise of stock options 2,412 2,412    
Exercise of stock options, shares   331    
Tax benefit from exercise of stock options 179 179    
Shares issued pursuant to stock-based compensation plan 1,387 1,387    
Cash dividends declared (26,725)   (26,725)  
Net earnings 55,144   55,144  
Other comprehensive income 6,996     6,996
Ending balance at Sep. 30, 2012 754,207 483,951 221,791 48,465
Ending balance, shares at Sep. 30, 2012   104,813    
Beginning balance at Dec. 31, 2012 762,970 484,709 235,010 43,251
Beginning balance, shares at Dec. 31, 2012   104,890    
Repurchase of common stock (459) (459)    
Repurchase of common stock, shares   (36)    
Exercise of stock options 2,651 2,651    
Exercise of stock options, shares   259    
Tax benefit from exercise of stock options 215 215    
Shares issued pursuant to stock-based compensation plan 1,439 1,439    
Shares issued pursuant to stock-based compensation plan, shares   97    
Cash dividends declared (29,925)   (29,925)  
Net earnings 70,320   70,320  
Other comprehensive income (38,989)     (38,989)
Ending balance at Sep. 30, 2013 $ 768,222 $ 488,555 $ 275,405 $ 4,262
Ending balance, shares at Sep. 30, 2013   105,210