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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Unrealized Investment Gains (Losses) [Member]
Currency Translation Adjustments [Member]
Net Pension Asset [Member]
Treasury Stock [Member]
Noncontrolling Interests [Member]
Accumulated Other Comprehensive Income [Member]
Beginning of period at Dec. 31, 2009 $ 47,024$ 926,359$ 3,785,187$ 219,394$ (40,371)$ (15,816)$ (1,325,710)$ 5,879 
Stock options exercised and restricted units issued, net of tax  (12,239)       
Restricted stock units expensed  18,772       
Stock issued to directors  198    536  
Net income to common stockholders322,674  322,436      
Dividends   (29,826)      
Unrealized gains (losses) on securities not other-than-temporarily impaired    230,804     
Unrealized gains on other-than-temporarily impaired securities    437     
Net change in period765    765    
Net change in period1,681     1,681   
Stock exercised/vested       17,054  
Stock repurchased       (319,293)  
Contributions (distributions)        581 
Net income (loss)238       238 
Other comprehensive income, net of tax233,698       11 
End of period at Sep. 30, 2010 47,024933,0904,077,797450,635(39,606)(14,135)(1,627,413)6,709396,894
Beginning of period at Dec. 31, 20103,709,85647,024935,0994,194,684334,747(42,488)(15,696)(1,750,494)6,980 
Stock options exercised and restricted units issued, net of tax  (26,914)       
Restricted stock units expensed  18,855       
Stock issued to directors  308    564  
Net income to common stockholders276,779  276,877      
Dividends   (32,274)      
Unrealized gains (losses) on securities not other-than-temporarily impaired    79,435     
Unrealized gains on other-than-temporarily impaired securities    (1,271)     
Net change in period(21,104)    (21,104)    
Net change in period2,118     2,118   
Stock exercised/vested       40,571  
Stock repurchased       (177,648)  
Contributions (distributions)        522 
Net income (loss)(98)       (98) 
Other comprehensive income, net of tax59,189       11 
End of period at Sep. 30, 2011$ 3,869,808$ 47,024$ 927,348$ 4,439,287$ 412,911$ (63,592)$ (13,578)$ (1,887,007)$ 7,415$ 335,741