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Derivative Instruments and Risk Management Activities (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Floor Plan Interest Expense $ (10,452,000) $ (10,690,000) $ (31,695,000) $ (30,927,000)
Derivatives in cash flow hedging relationship        
Interest rate swap contracts 577,000 (2,691,000) (5,787,000) 4,999,000
Increase Decrease In Floor Plan Interest Expense Due To Interest Rate Hedges 2,400,000 2,500,000    
Floorplan Interest Expense [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Floor Plan Interest Expense     (7,331,000) (7,390,000)
Other Interest Expense [Member]
       
Location of Loss Reclassified from OCI into Statements of Operations        
Interest Expense     (1,138,000) (930,000)
Interest Rate Swap Contracts [Member]
       
Derivatives in cash flow hedging relationship        
Interest rate swap contracts     $ (5,787,000) $ 4,999,000