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Debt And Other Financing Arrangements (Narrative) (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Mar. 30, 2011
Dec. 31, 2010
Debt Instrument [Line Items]   
Terminated revolving credit facility $ 250,000,000 
Line of credit facility outstanding  221,600,000
Line of credit facility expiration dateJune 2012  
Remaining borrowing capacity0  
Cash collateral for borrowed securities 250,000,000 
Write-off of unamortized issuance costs1,300,000  
Retired senior notes53,000,000  
Loss on debt retirements(3,537,000)  
Letter Of Credit [Member]
   
Debt Instrument [Line Items]   
Line of credit facility outstanding89,400,000  
Maximum borrowing capacity192,000,000  
Unsecured Letter Of Credit Facility [Member]
   
Debt Instrument [Line Items]   
Line of credit facility outstanding155,300,000 167,200,000
Line of credit facility expiration dateJune 2014  
Maximum borrowing capacity200,000,000  
Senior Notes [Member]
   
Debt Instrument [Line Items]   
Loss on debt retirements$ 3,500,000