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Derivative Instruments and Risk Management Activities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivatives in cash flow hedging relationship    
Interest rate swap contracts $ (11,141) $ (6,513)
Location of Loss Reclassified from OCI into Statements of Operations    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax (2,114) (1,967)
Floorplan Interest Expense [Member]    
Location of Loss Reclassified from OCI into Statements of Operations    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 2,758 2,708
Other Interest Expense [Member]    
Location of Loss Reclassified from OCI into Statements of Operations    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 625 439
Interest Rate Swap Contracts [Member]    
Derivatives in cash flow hedging relationship    
Interest rate swap contracts $ (11,141) $ (6,513)