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Debt (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Debt Instrument [Line Items]          
Extinguishment of Debt, Amount $ 27,000,000 $ 96,400,000 $ 461,400,000 $ 96,400,000  
Loss on debt retirements 3,858,000 0 26,930,000 0  
Letters of Credit Outstanding, Amount 178,100,000   178,100,000   179,200,000
Days from time of origination of loan to point of sale to third party     30 days    
Line of Credit Facility, Amount Outstanding 115,098,000   115,098,000   138,795,000
Unsecured Debt [Member]
          
Debt Instrument [Line Items]          
Letters of Credit Outstanding, Amount 124,400,000   124,400,000   124,600,000
Maximum Borrowing Capacity 150,000,000   150,000,000    
Credit facility expiration date     Sep. 01, 2014    
Letter of Credit [Member]
          
Debt Instrument [Line Items]          
Letters of Credit Outstanding, Amount 53,700,000   53,700,000   54,500,000
Repurchse Agreement [Member] | Financial Services [Member]
          
Debt Instrument [Line Items]          
Maximum Borrowing Capacity 150,000,000   150,000,000    
Credit facility expiration date     Sep. 12, 2014    
Line of Credit Facility, Initiation Date     Sep. 13, 2013    
Line of Credit Facility, Amount Outstanding $ 115,098,000   $ 115,098,000