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Statements Of Changes In Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statements Of Changes In Equity [Abstract]
Unrealized gain (loss) on derivative instruments, tax expense (income)	$ 740	$ 308	$ 749
Unrealized pension income (loss), tax income (expense)	9,910	1,119	1,473
Unrealized income (loss) on available for sale securities, tax expense (income)		990	1,103
Cumulative effect from adoption of FSP 115-2 (codified in ASC 320-10, Investments - Debt and Equity Securities), tax expense			1,772
Realized loss on available for sale securities, expense	$ 250

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

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Tax effect of the gross appreciation or the gross loss, net of reclassification adjustment, in the value of the total unsold available-for-sale securities at the end of an accounting period.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 25

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Tax effect on the accumulated change in the value of either the projected benefit obligation or plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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