Investments In Securities (Schedule Of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 10,959
Due after one year through five years, Amortized Cost	39,894
Due five years through ten years, Amortized Cost	46,032
Due after ten years, Amortized Cost	2,138
Total, Amortized Cost	99,023
Due in one year or less, Fair Value	10,985
Due after one year through five years, Fair Value	40,678
Due five years through ten years, Fair Value	46,113
Due after ten years, Fair Value	2,613
Total, Fair Value	$ 100,389	$ 103,341