Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments (Summary Of Interest Rate Swap Agreements) (Details)

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Derivative Financial Instruments (Summary Of Interest Rate Swap Agreements) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Derivative [Line Items]  
Notional Amount $ 245
Interest Rate Swaps [Member]
 
Derivative [Line Items]  
Notional Amount 20
Effective Date Sep. 04, 2005
Expiration Date Sep. 04, 2013
Fixed Rate Paid 4.435%
Floating Rate Received 6 month LIBOR
Interest Rate Swap One [Member]
 
Derivative [Line Items]  
Notional Amount 75
Effective Date Sep. 01, 2011
Expiration Date Aug. 01, 2018
Fixed Rate Paid 2.37%
Floating Rate Received 1 month LIBOR
Interest Rate Swap Two [Member]
 
Derivative [Line Items]  
Notional Amount 50
Effective Date Sep. 01, 2011
Expiration Date Aug. 01, 2018
Fixed Rate Paid 2.37%
Floating Rate Received 1 month LIBOR
Interest Rate Swap Three [Member]
 
Derivative [Line Items]  
Notional Amount 50
Effective Date Dec. 30, 2011
Expiration Date Dec. 29, 2017
Fixed Rate Paid 1.6125%
Floating Rate Received 1 month LIBOR
Interest Rate Swap Four [Member]
 
Derivative [Line Items]  
Notional Amount 25
Effective Date Dec. 30, 2011
Expiration Date Dec. 29, 2017
Fixed Rate Paid 1.6125%
Floating Rate Received 1 month LIBOR
Interest Rate Swap Five [Member]
 
Derivative [Line Items]  
Notional Amount $ 25
Effective Date Dec. 30, 2011
Expiration Date Dec. 29, 2017
Fixed Rate Paid 1.6125%
Floating Rate Received 1 month LIBOR