Financial Derivative Instruments - Realized and Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative instrument
Losses on fuel derivatives recorded as Nonoperating Expense	$ (297)	$ (4,553)	$ (6,933)	$ (7,203)
Reclassification from de-designation	500		3,900
Derivatives not designated as hedges \| Fuel derivative contracts
Derivative instrument
Losses realized at settlement	(2,062)	(3,399)	(7,899)	(9,294)
Reversal of prior period unrealized amounts	3,287	4,936	2,488	8,181
Unrealized losses that will settle in future periods	(1,522)	(6,090)	(1,522)	(6,090)
Losses on fuel derivatives recorded as Nonoperating Expense	$ (297)	$ (4,553)	$ (6,933)	$ (7,203)

Derivative Instruments Reversal Of Prior Period Unrealized Gains (Losses)

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- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-Topic 942
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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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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