Investments (Schedule Of Debt Securities By Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investments [Abstract]
Due within 1 year	$ 67,140	$ 59,896
Due within more than 1 year but less than 5 years	53,842	60,178
Due within more than 5 years but less than 10 years	0	0
Due 10 years or after	335	330
Total	$ 121,317	$ 120,404