Nonpension Postretirement Benefits (Amounts Recognized in Balance Sheet) (Details) (Nonpension Postretirement Benefit Plans, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Nonpension Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Current liability	$ 4,739	$ 4,721
Long-term liability	71,468	68,496
Net accrued benefit liability	$ 76,207	$ 73,217

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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