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Fair Value Measurements (Significant Unobservable Input (Level 3) Fair Value Measurements) (Details)
$ in Thousands
6 Months Ended
Sep. 30, 2018
USD ($)
Fixed Maturities - Asset Backed Securities  
Balance at March 31, 2018 $ 277
Fixed Maturities - Asset backed securities - redeemed (46)
Fixed Maturities - Asset Backed Securities - net gain (unrealized) 19
Balance at September 30, 2018 $ 250