Retirement Plans (Schedule Of Expected Benefit Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	$ 2,053
2013	2,192
2014	2,144
2015	2,127
2016	2,790
2017 - 2021	13,973
Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	120
2013	128
2014	146
2015	157
2016	139
2017 - 2021	763
Benefit Equalization Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	161
2013	161
2014	161
2015	191
2016	192
2017 - 2021	$ 966