Summary Of Significant Accounting Policies (Schedule Of Cost And Estimated Fair Values Of Debt Securities By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Total restricted securities available for sale	$ 0	$ 810
Cost [Member]
Summary Of Significant Accounting Policies [Line Items]
Within one year	0	45
Over one year to five years	0	759
Total restricted securities available for sale	0	804
Estimated Fair Value [Member]
Summary Of Significant Accounting Policies [Line Items]
Within one year	0	44
Over one year to five years	0	766
Total restricted securities available for sale	$ 0	$ 810