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Derivative Instruments and Risk Management Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Derivatives in cash flow hedging relationship |  |  |  |
Interest rate swap contracts | $ (257) | $ 1,188 | $ (2,437) | $ (15,575)
Location of Loss Reclassified from OCI into Statements of Operations |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | $ (1,711) | $ (2,112) | (5,968) | (6,367)
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 |  |  | 7,995 | 8,414
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 |  |  | $ (1,554) | 1,775
Interest Rate Swap Contracts [Member] |  |  |  |
Derivatives in cash flow hedging relationship |  |  |  |
Interest rate swap contracts |  |  |  | $ (15,575)

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