Retirement Plans (Schedule Of Amounts In Accumulated Other Comprehensive Income (Loss) Expected To Be Recognized As An Expense Component Of Net Periodic Benefit Cost For The Plans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss)	$ (9,382)
Total	(9,382)
Supplemental Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss)	112
Prior service credit (cost)	(125)
Total	(13)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss)	87
Prior service credit (cost)	244
Total	$ 331