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Derivative Instruments and Risk Management Activities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivatives in cash flow hedging relationship        
Interest rate swap contracts $ (2,570) $ (5,621) $ (2,180) $ (16,763)
Location of Loss Reclassified from OCI into Statements of Operations        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax $ 1,989 $ 2,141 4,256 4,256
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     (5,656) (5,623)
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     $ 1,154 (1,186)
Interest Rate Swap Contracts [Member]        
Derivatives in cash flow hedging relationship        
Interest rate swap contracts       $ (16,763)