Employee Benefits (Schedule Of Change In Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, end of year	$ 35,478	$ 32,867
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	32,867	28,580
Actual return	833	3,782
Employer contribution	3,946	2,546
Benefits paid	(2,168)	(2,041)
Fair value of plan assets, end of year	35,478	32,867
Funded status, end of year	(24,398)	(21,166)
Post-Retirement Healthcare Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	1,507	1,309
Benefits paid	(1,507)	(1,309)
Funded status, end of year	$ (20,212)	$ (20,047)