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Schedule III - Supplementary Insurance Information Level 4 (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplementary Insurance Information, by Segment [Line Items]      
Supplementary Insurance Information, Premium Revenue $ 101,883 $ 88,340 $ 81,057
Supplementary Insurance Information, Net Investment Income 1,286,923 1,218,780 1,036,106
Supplementary Insurance Information, Benefits, Claims, Losses and Settlement Expense 1,200,218 750,214 932,292
Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Costs 164,919 143,478 136,388
Supplementary Insurance Information, Other Operating Expense 137,432 113,169 151,646
Supplementary Insurance Information, Deferred Policy Acquisition Costs 1,709,799 1,683,857 1,747,760
Supplementary Insurance Information, Liability for Future Policy Benefits, Losses, Claims and Loss Expense Reserves 31,773,988 28,118,716 23,655,807
Supplementary Insurance Information, Unearned Premiums 0 0 0
Supplementary Insurance Information, Other Policy Claims and Benefits Payable $ 455,752 $ 400,594 $ 222,860