Investments (Schedule Of Debt Securities By Contractual Maturity Date) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Investments [Abstract]
Due within 1 year	$ 81,410	$ 46,339
Due within more than 1 year but less than 5 years	58,955	44,865
Due within more than 5 years but less than 10 years	0	0
Due 10 years or after	2,459	2,486
Total	$ 142,824	$ 93,690