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Pension And Postretirement Benefits (Changes In The Fair Value Of The Pension Plans' Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Change in plan assets, Fair value of plan assets at end of year	$ 678,250	$ 661,319
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Change in plan assets, Fair value of plan assets at end of year	67,967	71,549
Significant Unobservable Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Change in plan assets, Fair value of plan assets at end of year		17,169
Significant Unobservable Inputs Level 3 [Member] \| Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Change in plan assets, Fair value of plan assets at beginning of year	17,169	14,885
Total Realized and Unrealized Gains/(Losses)	(1,498)	2,284
Purchases, Sales, Settlements Transfers in or out of Level 3	(15,671)
Change in plan assets, Fair value of plan assets at end of year		$ 17,169

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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