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Reinsurance (Reinsurance Info) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
effectsofreinsurance          
Reinsurance Recoverable, Guarantee Benefits $ 655,240   $ 655,240   $ 1,732,969
Statement [Line Items]          
Total realized investment gains (losses), net (43,415) 35,160 (81,511) (923)  
Policyholders' benefits 27,685 41,459 46,303 32,202  
Operating Expenses Other Than Amortization Of Deferred Policy Acquisition Costs $ 100,302 $ 106,917 $ 200,445 $ 216,777