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Consolidated Statements of Changes in Equity (USD $)
In Thousands
Total
Common Stock
Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Noncontrolling Interest
Beginning Balance at Dec. 31, 2010 $ 857,518 $ 126,867 $ 165,447 $ 570,320 $ (5,116)  
Beginning Balance (in shares) at Dec. 31, 2010   63,433        
Net income 91,256     91,256    
Other comprehensive income 363       363  
Comprehensive income 91,619          
Dividends declared (38,156)     (38,156)    
Shares repurchased and retired (in shares)   (524)        
Shares repurchased and retired (16,124) (1,048)   (15,076)    
Share-based compensation expense, exercises and other (in shares)   515        
Share-based compensation expense, exercises and other 12,122 1,029 11,093      
Ending Balance at Sep. 30, 2011 906,979 126,848 176,540 608,344 (4,753)  
Ending Balance (in shares) at Sep. 30, 2011   63,424        
Beginning Balance at Dec. 31, 2011 919,217 126,900 179,052 619,629 (7,494) 1,130
Beginning Balance (in shares) at Dec. 31, 2011 63,449 63,449        
Net income 84,070     84,070    
Other comprehensive income 2,531       2,531  
Comprehensive income 86,601          
Dividends declared (41,791)     (41,791)    
Shares repurchased and retired (in shares) (390) (390)        
Shares repurchased and retired (11,250) (780)   (10,470)    
Share-based compensation expense, exercises and other (in shares)   321        
Share-based compensation expense, exercises and other 7,285 642 6,643      
Ending Balance at Sep. 30, 2012 $ 960,062 $ 126,762 $ 185,695 $ 651,438 $ (4,963) $ 1,130
Ending Balance (in shares) at Sep. 30, 2012 63,380 63,380