Retirement Plans (Summary Of Reconciliation Of The Beginning And Ending Balances Of Assets Measured At Fair Value On A Recurring Basis Using Level 3 Inputs) (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Limited Partner [Member]	Dec. 31, 2012 Limited Partner [Member]	Dec. 31, 2013 Guaranteed Deposit Account [Member]	Dec. 31, 2012 Guaranteed Deposit Account [Member]	Dec. 31, 2013 Limited Partnerships [Member]	Dec. 31, 2012 Limited Partnerships [Member]	Dec. 31, 2013 Guaranteed Deposit Account [Member]	Dec. 31, 2012 Guaranteed Deposit Account [Member]	Dec. 31, 2013 Realized Appreciation (Depreciation) In Fair Value Of Investments [Member] Limited Partnerships [Member]	Dec. 31, 2012 Realized Appreciation (Depreciation) In Fair Value Of Investments [Member] Limited Partnerships [Member]	Dec. 31, 2013 Realized Appreciation (Depreciation) In Fair Value Of Investments [Member] Guaranteed Deposit Account [Member]	Dec. 31, 2012 Realized Appreciation (Depreciation) In Fair Value Of Investments [Member] Guaranteed Deposit Account [Member]	Dec. 31, 2013 Unrealized Appreciation (Depreciation) In Fair Value Of Investments [Member] Limited Partnerships [Member]	Dec. 31, 2012 Unrealized Appreciation (Depreciation) In Fair Value Of Investments [Member] Limited Partnerships [Member]	Dec. 31, 2013 Unrealized Appreciation (Depreciation) In Fair Value Of Investments [Member] Guaranteed Deposit Account [Member]	Dec. 31, 2012 Unrealized Appreciation (Depreciation) In Fair Value Of Investments [Member] Guaranteed Deposit Account [Member]	Dec. 31, 2013 Interest And Dividends [Member] Limited Partnerships [Member]	Dec. 31, 2012 Interest And Dividends [Member] Limited Partnerships [Member]	Dec. 31, 2013 Interest And Dividends [Member] Guaranteed Deposit Account [Member]	Dec. 31, 2012 Interest And Dividends [Member] Guaranteed Deposit Account [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Limited Partnerships [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Limited Partnerships [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] Limited Partnerships [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Guaranteed Deposit Account [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Guaranteed Deposit Account [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] Guaranteed Deposit Account [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Limited Partnerships [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Limited Partnerships [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Guaranteed Deposit Account [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Guaranteed Deposit Account [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 171,905	$ 157,082					$ 4,689		$ 13,869														$ 139,374	$ 120,379	$ 5,292	$ 4,689	$ 4,149	$ 12,582	$ 13,869	$ 12,476	$ 17,874	$ 18,558	$ 5,292	$ 4,689	$ 12,582	$ 13,869
Net increases (decreases) included in plan statement of changes in net assets available for benefits											(74)	(98)	0	0	732	542	(398)	372	0	0	486	525
Fair value of plan assets at end of year	171,905	157,082					5,292	4,689	12,582	13,869													139,374	120,379	5,292	4,689	4,149	12,582	13,869	12,476	17,874	18,558	5,292	4,689	12,582	13,869
Defined benefit plan investment purchases							760	1,005	11,722	11,070
Purchases							0	0	(12,751)	(10,212)
Defined Benefit Plan, Settlements, Plan Assets							(732)	(850)	0	0
Defined Benefit Plan, Administration Expenses			$ (83)	$ (59)	$ (346)	$ (362)