Employee Benefits (Schedule Of Change In Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, end of year	$ 42,325	$ 35,478
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	35,478	32,867
Actual return	4,207	833
Employer contribution	4,785	3,946
Benefits paid	(2,145)	(2,168)
Fair value of plan assets, end of year	42,325	35,478
Funded status, end of year	(22,988)	(24,398)
Post-Retirement Healthcare Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	0	0
Actual return	0	0
Employer contribution	1,604	1,507
Benefits paid	(1,604)	(1,507)
Fair value of plan assets, end of year	0	0
Funded status, end of year	$ (21,383)	$ (20,212)