Investments In Securities (Schedule Of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 9,394
Due after one year through five years, Amortized Cost	38,648
Due five years through ten years, Amortized Cost	43,289
Due after ten years, Amortized Cost	2,138
Total, Amortized Cost	93,469
Due in one year or less, Fair Value	9,387
Due after one year through five years, Fair Value	39,474
Due five years through ten years, Fair Value	43,184
Due after ten years, Fair Value	2,533
Total, Fair Value	$ 94,578	$ 103,341