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Fair Value Measurements (Details) - Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |  |
Derivative contracts |  | $ 2,485 | $ 4,358
Liabilities: |  |  |
Derivative contracts |  | 701 | 1,228
Level 1 [Member] |  |  |
Assets: |  |  |
Derivative contracts | [1] | 1,701 | 3,091
Liabilities: |  |  |
Derivative contracts | [1] | 589 | 693
Level 2 [Member] |  |  |
Assets: |  |  |
Derivative contracts | [2] | 784 | 1,267
Liabilities: |  |  |
Derivative contracts | [2] | 112 | 535
Level 3 [Member] |  |  |
Assets: |  |  |
Derivative contracts | [3] |  |
Liabilities: |  |  |
Derivative contracts | [3] |  |
[1] | quoted prices in active markets for identical assets or liabilities
[2] | observable inputs other than quoted prices in active markets for identical assets and liabilities
[3] | no observable pricing inputs in the market

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