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Significant Unobservable Input (Level 3) Fair Value Measurements (Details) (Fixed Maturities - Asset Backed Securities, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Fixed Maturities - Asset Backed Securities
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance $ 1,205
Fixed Maturities - Asset Backed Securities - redemption (7)
Fixed Maturities - Asset Backed Securities - gain (realized) 3
Fixed Maturities - Period Increase (Decrease) (4)
Balance $ 1,201