Available For Sale Securities (Amortized Cost And Estimated Fair Value Of Investments Classified As Available For Sale By Contractual Maturity) (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Investments [Abstract]
Due within one year, Amortized Cost	$ 242,572
Due after one year through five years, Amortized Cost	506
Fixed maturities investments excluding mortgage-backed and asset-backed securities, Amortized Cost	243,078
Mortgage-backed and asset-backed securities, Amortized Cost	51,331
Total fixed maturities investments, Amortized Cost	294,409
Due within one year, Estimated Fair Value	242,715
Due after one year through five years, Estimated Fair Value	511
Fixed maturities investments excluding mortgage-backed and asset-backed securities, Estimated Fair Value	243,226
Mortgage-backed and asset-backed securities, Estimated Fair Value	51,292
Total fixed maturities investments, Estimated Fair Value	$ 294,518