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Debt (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Extinguishment of Debt, Amount $ 0  
Letters of Credit Outstanding, Amount 172,700,000 179,200,000
Days from time of origination of loan to point of sale to third party 30 days  
Line of Credit Facility, Amount Outstanding 56,631,000 138,795,000
Unsecured Debt [Member]
    
Debt Instrument [Line Items]    
Letters of Credit Outstanding, Amount 122,700,000 124,600,000
Credit facility expiration date Sep. 01, 2014  
Maximum Borrowing Capacity 150,000,000  
Letter of Credit [Member]
    
Debt Instrument [Line Items]    
Letters of Credit Outstanding, Amount 50,000,000 54,500,000
Repurchse Agreement [Member] | Financial Services [Member]
    
Debt Instrument [Line Items]    
Credit facility expiration date Sep. 27, 2013  
Maximum Borrowing Capacity 150,000,000  
Line of Credit Facility, Initiation Date Sep. 28, 2012  
Line of Credit Facility, Amount Outstanding 56,600,000  
Subsequent Event [Member]
    
Debt Instrument [Line Items]    
Subsequent Event, Date Apr. 24, 2013  
Gains (Losses) on Extinguishment of Debt 18,000,000  
Amount of Tender Offer to Buyback Senior Notes $ 398,900,000