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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)

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