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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, 2015   $ 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     (652)            
Restricted stock units expensed     8,769            
Net income before noncontrolling interests $ 120,248     119,511         737
Dividends       (14,711)          
Change in unrealized investment gains, net of taxes 76,855       76,904        
Unrealized gains (losses) on other-than-temporarily impaired securities         (35)        
Change in unrealized currency translation adjustments (2,047)         (2,047)      
Stock exercised/vested               652  
Stock repurchased               (37,424)  
Contributions                 3,158
Other comprehensive income (loss) 74,808         (2,047) $ 74,808   (14)
End of period at Mar. 31, 2016     1,013,572 6,282,870 257,564 (249,440) 8,124 (2,600,377) 36,843
Beginning and end of period at Dec. 31, 2016 5,081,134 $ 47,024 1,037,446 6,595,987 427,154 (371,586)   (2,688,817) 33,926
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Restricted stock units issued     (667)            
Restricted stock units expensed     10,810            
Net income before noncontrolling interests 124,674     123,447         1,227
Dividends       (15,759)          
Change in unrealized investment gains, net of taxes (8,831)       (8,913)        
Unrealized gains (losses) on other-than-temporarily impaired securities         101        
Change in unrealized currency translation adjustments 22,735         22,735      
Stock exercised/vested               644  
Stock repurchased               0  
Contributions                 3,801
Other comprehensive income (loss) 13,904         22,735 13,904   (19)
End of period at Mar. 31, 2017 $ 5,218,541   $ 1,047,589 $ 6,703,675 $ 418,342 $ (348,851) $ 69,491 $ (2,688,173) $ 38,935