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Derivative Instruments and Risk Management Activities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Asset | $ 15,987 |  | $ 9,501
Derivative Asset, Noncurrent | 15,987 |  | 9,501
Derivative Liability, Noncurrent | 3,512 |  | 8,583
Derivative Liability, Current | 1,177 |  | 1,996
Derivatives in cash flow hedging relationship |  |  |
Interest rate swap contracts | 7,892 | $ 390 |
Location of Loss Reclassified from OCI into Statements of Operations |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (1,513) | (2,268) |
Derivative Liability | 4,689 |  | $ 10,579
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 | 1,737 | 2,948 |
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 | $ (254) | 681 |
Interest Rate Swap Contracts [Member] |  |  |
Derivatives in cash flow hedging relationship |  |  |
Interest rate swap contracts |  | $ 390 |

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