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Debt (Summary Of Drawings Under Revolving Credit Facilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Oct. 11, 2011
Line of Credit Facility [Line Items]    
Commitments $ 450,000  
Utilized 123,312  
Available 326,688  
Receivables Credit Facility [Member]
   
Line of Credit Facility [Line Items]    
Commitments 200,000 150,000
Utilized 109,000  
Available 91,000  
Senior Revolving Credit Facility [Member]
   
Line of Credit Facility [Line Items]    
Commitments 250,000  
Utilized 14,312  
Available $ 235,688