Pension Plans And Other Postretirement Benefit Plans (Changes In The Fair Value Of The Pension Plan's Level 3 Assets) (Details) (Level 3 [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Absolute Return [Member] | Common/Collective Trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets as of beginning of year	$ 95	$ 844
Realized gains (losses)	(748)	(233)
Unrealized gains (losses)	746	(193)
Purchases (sales), net	(93)	(323)
Fair value of plan assets as of end of year		95
Absolute Return [Member] | Partnership And Closely Held Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets as of beginning of year	16,917	15,794
Unrealized gains (losses)	(330)	1,123
Fair value of plan assets as of end of year	16,587	16,917
Private Equity Funds [Member] | Partnership And Closely Held Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets as of beginning of year	1,272	1,561
Realized gains (losses)	373	(148)
Unrealized gains (losses)	(218)	(48)
Purchases (sales), net	(619)	(93)
Fair value of plan assets as of end of year	808	1,272
Real Estate [Member] | Common/Collective Trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets as of beginning of year	423	6,029
Realized gains (losses)	22	630
Unrealized gains (losses)	1,098	(160)
Purchases (sales), net	7,055	(6,076)
Fair value of plan assets as of end of year	$ 8,598	$ 423