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Fair Value Measurements - Quantative Information about Level 3 Fair Value (Details) - Option Model - Implied Volatility - Fuel derivatives	Sep. 30, 2016
Fourth Quarter 2016
Quantitative Information About Level 3
Fair Value Measurement Range, Minimum	20.00%
Fair Value Measurement Range, Maximum	35.00%
2017
Quantitative Information About Level 3
Fair Value Measurement Range, Minimum	27.00%
Fair Value Measurement Range, Maximum	38.00%
2018
Quantitative Information About Level 3
Fair Value Measurement Range, Minimum	21.00%
Fair Value Measurement Range, Maximum	32.00%
2019
Quantitative Information About Level 3
Fair Value Measurement Range, Minimum	13.00%
Fair Value Measurement Range, Maximum	26.00%

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Quantitative information about Level 3 fair value measurements

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