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Reinsurance (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reinsurance [Line Items]      
Net premiums $ 7,906,596,000 $ 7,335,687,000 $ 6,659,680,000
Claims and other policy benefits 6,665,999,000 6,225,183,000 5,547,155,000
Direct Life Insurance [Member]
      
Reinsurance [Line Items]      
Net premiums 3,784,000 2,590,000 2,669,000
Claims and other policy benefits 3,694,000 4,179,000 4,062,000
Reinsurance Assumed [Member]
      
Reinsurance [Line Items]      
Net premiums 8,228,811,000 7,701,594,000 7,198,219,000
Claims and other policy benefits 6,912,942,000 6,472,041,000 5,877,153,000
Reinsurance Ceded [Member]
      
Reinsurance [Line Items]      
Net premiums (325,999,000) (368,497,000) (541,208,000)
Claims and other policy benefits $ (250,637,000) $ (251,037,000) $ (334,060,000)