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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 2,240 2,240    
Exercise of stock options, shares   326    
Tax benefit from exercise of stock options 176 176    
Shares issued pursuant to stock-based compensation plan 837 837    
Cash dividends declared Common (17,816)   (17,816)  
Net earnings 45,887   45,887  
Other comprehensive income 2,115     2,115
Ending balance at Jun. 30, 2012 748,253 483,226 221,443 43,584
Ending balance, shares at Jun. 30, 2012   104,808    
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 (61) (61)    
Repurchase of common stock, shares   (6)    
Exercise of stock options 780 780    
Exercise of stock options, shares   84    
Tax benefit from exercise of stock options 59 59    
Shares issued pursuant to stock-based compensation plan 893 893    
Shares issued pursuant to stock-based compensation plan, shares   10    
Cash dividends declared Common (19,414)   (19,414)  
Net earnings 46,081   46,081  
Other comprehensive income (39,234)     (39,234)
Ending balance at Jun. 30, 2013 $ 752,074 $ 486,380 $ 261,677 $ 4,017
Ending balance, shares at Jun. 30, 2013   104,978