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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Assets: |  |  |
Derivative Asset, Noncurrent | $ 15,987 | $ 9,501 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Assets: |  |  |
Interest Rate Derivative Assets, at Fair Value |  | 9,501 |
Total | 17,469 | 10,358 |
Liabilities: |  |  |
Total | 4,689 | 10,579 |
Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets: |  |  |
Investments, Fair Value Disclosure | 1,469 | 844 | $ 844
Demand Obligation [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets: |  |  |
Investments, Fair Value Disclosure | $ 13 | $ 13 |

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