Financial Derivative Instruments - Realized and Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Derivative instrument
Gains (losses) on fuel derivatives recorded as nonoperating income (expense)	$ (6,452)	$ 570
Reclassification from de-designation	2,800
Derivatives not designated as hedges \| Fuel derivative contracts
Derivative instrument
Losses realized at settlement	(3,086)	(2,844)
Reversal of prior period unrealized amounts	2,488	8,181
Unrealized losses that will settle in future periods	(5,854)	(4,767)
Gains (losses) on fuel derivatives recorded as nonoperating income (expense)	(6,452)	$ 570
Derivatives designated as hedges \| Foreign currency derivatives
Derivative instrument
Expected reclassification of net gain	$ 3,400
Reclassification estimated time period	12 months

Derivative Instruments Reversal Of Prior Period Unrealized Gains (Losses)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Estimated period for the anticipated transfer of gain (loss), net, from accumulated other comprehensive income into earnings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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- Definition

Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from discontinuance of cash flow hedge included in assessment of hedge effectiveness.

+ References

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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