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Debt (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Debt Instrument [Line Items]      
Extinguishment of Debt, Amount $ 245,700,000 $ 0  
Loss on debt retirements 8,584,000 0  
Letters of Credit Outstanding, Amount 161,800,000   183,100,000
Line of Credit Facility, Amount Outstanding 35,836,000   105,664,000
Unsecured Letter of Credit [Member]
      
Debt Instrument [Line Items]      
Letters of Credit Outstanding, Amount 99,400,000   124,400,000
Maximum Borrowing Capacity 150,000,000    
Financial Services [Member] | Unsecured Letter of Credit [Member]
      
Debt Instrument [Line Items]      
Line of Credit Facility, Expiration date Sep. 01, 2014    
Letter of Credit [Member]
      
Debt Instrument [Line Items]      
Letters of Credit Outstanding, Amount 62,400,000   58,700,000
Repurchase Agreement [Member] | Financial Services [Member]
      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity 99,800,000   150,000,000
Line of Credit Facility, Expiration date Sep. 12, 2014    
Line of Credit Facility, Initiation Date Jan. 09, 2014    
Line of Credit Facility, Amount Outstanding $ 35,800,000   $ 105,700,000