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Financial Instruments - Available For Sale Securities (Amortized Cost And Estimated Fair Value Of Investments Classified As Available For Sale By Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Financial Instruments - Available For Sale Securities [Abstract]  
Due within one year, Amortized Cost $ 1,485,139
Due after one year through five years, Amortized Cost 12,291
Due after five years through ten years, Amortized Cost   
Due after ten years, Amortized Cost   
Fixed maturities investments excluding mortgage-backed and asset-backed securities, amortized cost 1,497,430
Mortgage-backed and asset-backed securities, Amortized Cost 819,843
Total fixed maturities investments, Amortized Cost 2,317,273
Due within one year, Estimated Fair Value 1,485,419
Due after one year through five years, Estimated Fair Value 12,366
Due after five years through ten years, Estimated Fair Value   
Due after ten years, Estimated Fair Value   
Fixed maturities investments excluding mortgage-backed and asset-backed securities, estimated fair value 1,497,785
Mortgage-backed and asset-backed securities, Estimated Fair Value 835,525
Total fixed maturities investments, Estimated Fair Value $ 2,333,310