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Fair Value Measurements - Quantative Information about Level 3 Fair Value (Details) - Option Model - Implied Volatility - Fuel derivatives | Mar. 31, 2016
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2018 |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 23.00%
Fair Value Measurement Range, Maximum | 32.00%
2017 |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 28.00%
Fair Value Measurement Range, Maximum | 41.00%
Fourth Quarter 2016 |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 32.00%
Fair Value Measurement Range, Maximum | 43.00%
Third Quarter 2016 |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 33.00%
Fair Value Measurement Range, Maximum | 43.00%
Second Quarter 2016 |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 22.00%
Fair Value Measurement Range, Maximum | 42.00%

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- Definition Maximum range used in level 3 fair value calculation + References No definition available. + Details
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- Definition Minimum range used in level 3 fair value calculation + References No definition available. + Details
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