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Debt and Other Financing Arrangements (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Mar. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
Senior Notes [Member]
Dec. 31, 2010
Senior Notes [Member]
Jun. 30, 2011
Unsecured Letter of Credit Facility [Member]
Dec. 31, 2010
Unsecured Letter of Credit Facility [Member]
Jun. 30, 2011
Letter of Credit [Member]
Terminated revolving credit facility     $ 250,000,000            
Line of credit facility outstanding 103,900,000 103,900,000   221,600,000     151,200,000 167,200,000  
Line of credit facility expiration date   June 2012         June 2014    
Remaining borrowing capacity 0 0              
Cash Collateral for Borrowed Securities     250,000,000            
Write-Off of unamortized issuance costs   1,300,000              
Retired senior notes 53,000,000                
Loss on debt retirements 3,496,000 3,537,000     3,500,000 3,500,000      
Maximum borrowing capacity             $ 200,000,000   $ 192,000,000