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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in AOCI by Component (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning Balance     $ 8,324,285      
Total other comprehensive income (loss) $ (424,661) $ 291,830 (998,300) $ 452,794    
Ending Balance 7,307,934   7,307,934   $ 8,324,285  
Offset of net unrealized losses in AOCI due to impact those net unrealized losses would have on certain of the Company's insurance assets and liabilities had the net unrealized losses been recognized in net income     361,600   (6,300) $ 424,100
Unrealized Gains and Losses on Investments            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning Balance     23,069 (655,767) (655,767)  
Other comprehensive income (loss) before reclassifications     (997,757)   699,097  
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings     (3,647)   7,153  
Amounts reclassified from accumulated other comprehensive income (loss)     22   (944)  
Total other comprehensive income (loss)     (1,001,382)   705,306  
Cumulative effect adjustment     (10,552)   (26,470)  
Ending Balance (988,865)   (988,865)   23,069 (655,767)
Accumulated Gain and Loss Derivatives            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning Balance     747 727 727  
Other comprehensive income (loss) before reclassifications     2,831   (563)  
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings     0   0  
Amounts reclassified from accumulated other comprehensive income (loss)     251   451  
Total other comprehensive income (loss)     3,082   (112)  
Cumulative effect adjustment     0   132  
Ending Balance 3,829   3,829   747 727
Total Accumulated Other Comprehensive Income (Loss)            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning Balance     23,816 $ (655,040) (655,040)  
Other comprehensive income (loss) before reclassifications     (994,926)   698,534  
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings     (3,647)   7,153  
Amounts reclassified from accumulated other comprehensive income (loss)     273   (493)  
Total other comprehensive income (loss)     (998,300)   705,194  
Cumulative effect adjustment     (10,552)   (26,338)  
Ending Balance $ (985,036)   $ (985,036)   $ 23,816 $ (655,040)