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Derivative Instruments and Risk Management Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivatives in cash flow hedging relationship
Interest rate swap contracts	$ 1,188	$ (8,199)	$ (15,575)	$ (12,907)
Location of Loss Reclassified from OCI into Statements of Operations
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ (2,112)	$ (2,041)	(6,367)	(5,988)
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			8,414	8,306
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			$ 1,775	1,275
Interest Rate Swap Contracts [Member]
Derivatives in cash flow hedging relationship
Interest rate swap contracts				$ (12,907)