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Comprehensive Income (Details 1) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Comprehensive income      
Fixed maturity securities available-for-sale $ 22,291,614,000 $ 16,200,950,000  
Other invested assets 1,159,543,000 1,012,541,000  
Deferred policy acquisition costs 3,619,274,000 3,543,925,000  
Accumulated Other Comprehensive Income Loss Change In Component During Period 705,021,000 1,043,844,000 814,436,000
Change In Net Unrealized Appreciation Depreciation [Member]
      
Comprehensive income      
Fixed maturity securities available-for-sale 713,778,000 1,058,505,000 813,174,000
Other invested assets 6,181,000 (7,213,000) 16,933,000
Effect On Unrealized Appreciation Depreciation [Member]
      
Comprehensive income      
Deferred policy acquisition costs $ (14,938,000) $ (7,448,000) $ (15,671,000)