Pension And Postretirement Benefits (Schedule Of Fair Value Of Company Pension Plan Assets) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	$ 735,580,000	$ 678,250,000
Quoted Prices In Active Markets For Identical Assets Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	113,971,000	131,953,000
Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	621,609,000	546,297,000
Cash and Money Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	8,130,000	38,084,000
Cash and Money Markets [Member] | Quoted Prices In Active Markets For Identical Assets Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	8,130,000	38,084,000
Common Stocks Actively Managed U.S. Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	105,841,000	93,869,000
Common Stocks Actively Managed U.S. Equities [Member] | Quoted Prices In Active Markets For Identical Assets Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	105,841,000	93,869,000
Fixed Income Bonds And Notes [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	26,875,000	25,485,000
Fixed Income Bonds And Notes [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	26,875,000	25,485,000
U.S. Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	80,171,000	26,322,000
U.S. Equity Funds [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	80,171,000	26,322,000
Non-U.S. Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	178,841,000	198,655,000
Non-U.S. Equity Funds [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	178,841,000	198,655,000
U.S. Fixed Income, Government and Corporate [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	43,182,000	33,810,000
U.S. Fixed Income, Government and Corporate [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	43,182,000	33,810,000
U.S. Tactical Allocation Balanced Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	18,997,000	16,455,000
U.S. Tactical Allocation Balanced Fund [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	18,997,000	16,455,000
Non-U.S. Fixed Income, Government And Corporate [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	181,073,000	159,611,000
Non-U.S. Fixed Income, Government And Corporate [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	181,073,000	159,611,000
International Balanced Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	8,836,000	8,223,000
International Balanced Funds [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	8,836,000	8,223,000
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	73,430,000	67,967,000
Hedge Funds [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	73,430,000	67,967,000
International Property Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	9,445,000	9,011,000
International Property Funds [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	9,445,000	9,011,000
Annuity Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	759,000	758,000
Annuity Contract [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	$ 759,000	$ 758,000