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Consolidated Statements of Stockholders' Equity Statement - USD ($)
$ in Thousands
Total
Common stocks
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Noncontrolling Interest [Member]
Beginning and end of period at Dec. 31, 2014   $ 47,024 $ 991,512 $ 5,732,410 $ 306,199 $ (122,649)   $ (2,364,551) $ 34,189
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Restricted stock units issued including tax benefit     (2,295)            
Restricted stock units expensed     14,350            
Net income before noncontrolling interests $ 241,493     241,342         151
Dividends       (28,447)          
Change in unrealized investment gains, net of taxes (83,329)       (83,332)        
Unrealized gains on other-than-temporarily impaired securities         15        
Change in unrealized currency translation adjustments (14,178)         (14,178)      
Stock exercised/vested               2,919  
Stock repurchased               (218,132)  
Contributions (distributions)                 (183)
Other comprehensive income (loss) (97,507)         (14,178) $ (97,507)   (12)
End of period at Jun. 30, 2015     1,003,567 5,945,305 222,882 (136,827) 86,055 (2,579,764) 34,145
Beginning and end of period at Dec. 31, 2015 4,633,208 $ 47,024 1,005,455 6,178,070 180,695 (247,393)   (2,563,605) 32,962
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Restricted stock units issued including tax benefit     (191)            
Restricted stock units expensed     16,350            
Net income before noncontrolling interests 229,153     228,477         676
Dividends       (30,654)          
Change in unrealized investment gains, net of taxes 181,888       180,714        
Unrealized gains on other-than-temporarily impaired securities         1,183        
Change in unrealized currency translation adjustments (57,917)         (57,917)      
Stock exercised/vested               1,717  
Stock repurchased               (37,424)  
Contributions (distributions)                 2,923
Other comprehensive income (loss) 123,971         (57,917) 123,971   (9)
End of period at Jun. 30, 2016 $ 4,939,053   $ 1,021,614 $ 6,375,893 $ 362,592 $ (305,310) $ 57,282 $ (2,599,312) $ 36,552