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Debt (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Debt Instrument [Line Items]          
Extinguishment of Debt, Amount $ 434,400,000 $ 0 $ 434,400,000 $ 0  
Loss on debt retirements 23,072,000 0 23,072,000 0  
Letters of Credit Outstanding, Amount 171,600,000   171,600,000   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 59,866,000   59,866,000   138,795,000
Unsecured Debt [Member]
          
Debt Instrument [Line Items]          
Letters of Credit Outstanding, Amount 121,300,000   121,300,000   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 50,300,000   50,300,000   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. 27, 2013    
Line of Credit Facility, Initiation Date     Sep. 28, 2012    
Line of Credit Facility, Amount Outstanding $ 59,866,000   $ 59,866,000