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Reinsurance (Reinsurance Info) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
effectsofreinsurance      
Reinsurance Recoverable, Guarantee Benefits $ 1,192,488   $ 1,732,969
Statement [Line Items]      
Total realized investment gains (losses), net (38,096) (36,083)  
Policyholders' benefits 18,618 (9,257)  
Operating Expenses Other Than Amortization Of Deferred Policy Acquisition Costs $ 100,143 $ 109,860