Multiemployer Pension And Postretirement Plans (Narrative) (Details) (Multiemployer Pension Plans Defined Benefit [Member])	12 Months Ended
	Dec. 31, 2011
Multiemployer Pension Plans Defined Benefit [Member]
Multiemployer Plans [Line Items]
Pension Protection Act Red Zone Funded Status Maximum	65.00%
Pension Protection Act Yellow Zone Funded Status Minimum	65.00%
Pension Protection Act Yellow Zone Funded Status Maximum	80.00%
Pension Protection Act Green Zone Funded Status Minimum	80.00%