Pension Plans And Other Postretirement Benefits (Schedule Of Financial Assets Accounted For At Fair Value On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 531,105	[1]	$ 507,064	[1]
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	531,105		507,064		417,125
Pension Benefits [Member] | Domestic Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	229,842	[2]	233,788	[2],[3]
Pension Benefits [Member] | International Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	90,056	[4]	91,239	[4]
Pension Benefits [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	129,608	[5]	108,471	[5]
Pension Benefits [Member] | Absolute Return [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	78,432	[6]	70,520	[3],[6]
Pension Benefits [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,167		3,046
Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Items (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	228,592		216,105
Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Items (Level 1) [Member] | Domestic Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	173,710	[2]	173,079	[2],[3]
Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Items (Level 1) [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46,308	[5]	38,859	[5]
Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Items (Level 1) [Member] | Absolute Return [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,407	[6]	1,121	[3],[6]
Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Items (Level 1) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,167		3,046
Pension Benefits [Member] | Quoted Prices In Active Markets For Similar Items (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	229,488		221,560
Pension Benefits [Member] | Quoted Prices In Active Markets For Similar Items (Level 2) [Member] | Domestic Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56,132	[2]	60,709	[2],[3]
Pension Benefits [Member] | Quoted Prices In Active Markets For Similar Items (Level 2) [Member] | International Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	90,056	[4]	91,239	[4]
Pension Benefits [Member] | Quoted Prices In Active Markets For Similar Items (Level 2) [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	83,300	[5]	69,612	[5]
Pension Benefits [Member] | Unobservable inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	73,025		69,399		65,902
Pension Benefits [Member] | Unobservable inputs (Level 3) [Member] | Absolute Return [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	73,025	[6]	69,399	[3],[6]
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,681	[1]	7,985	[1]	8,207
Other Postretirement Benefits [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,681	[5]	7,985	[5]
Other Postretirement Benefits [Member] | Quoted Prices In Active Markets For Similar Items (Level 2) [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 7,681	[5]	$ 7,985	[5]

[1] See Note 17 "Pension Plans and Other Postretirement Benefits" for further discussion on fair value measurements of our pension and postretirement assets.

[2] Consists primarily of U.S. equity securities covering a diverse group of companies and U.S. stock funds that primarily track or are actively managed and measured against indices including the S&P 500 and the Russell 2000.

[3] In 2011, amounts were reclassified from Absolute Return to Domestic Equity, levels 1 and 2 only. These reclassifications had no impact on total pension assets by level.

[4] Consists primarily of international equity funds which include stocks and debt obligations of non-U.S. entities that primarily track or are actively managed and measured against various MSCI indices.

[5] Consists primarily of fixed income mutual funds, corporate bonds, U.S. Treasury notes, other government securities and insurance policies.

[6] Consists primarily of holdings in private investment companies. See additional information about the Absolute Return investments below.