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Employee Benefit Plans And Other Postretirement Benefits (Components Of Amounts Recognized In Balance Sheet) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]    
Amounts Recognized in Statement of Financial Position, Current liabilities $ (6,284) $ (5,253)
Amounts Recognized in Statement of Financial Position, Noncurrent liabilities (148,686) (97,914)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Total 74,076 45,938
Net Pension Costs [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Development of Net Amount Recognized, Benefit obligation in excess of plan assets at December 31 (129,033) (79,952)
Amounts Recognized in Statement of Financial Position, Current liabilities (5,232) (4,107)
Amounts Recognized in Statement of Financial Position, Noncurrent liabilities (123,801) (75,845)
Amounts Recognized in Statement of Financial Position, Accrued benefit recognized at December 31 (129,033) (79,952)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Prior service cost 23,573 25,957
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Actuarial loss 45,791 15,714
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Total 69,364 41,671
Net Postretirement Costs [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Development of Net Amount Recognized, Benefit obligation in excess of plan assets at December 31 (25,937) (23,215)
Amounts Recognized in Statement of Financial Position, Current liabilities (1,052) (1,146)
Amounts Recognized in Statement of Financial Position, Noncurrent liabilities (24,885) (22,069)
Amounts Recognized in Statement of Financial Position, Accrued benefit recognized at December 31 (25,937) (23,215)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Prior service cost (481) (734)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Actuarial loss 5,193 5,001
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Total $ 4,712 $ 4,267