Fair Value Measurements and Derivatives - Effects of Derivatives Not Designated as Hedging Instruments on Consolidated Statements of Operations (Details) $ in Thousands |
12 Months Ended |
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Dec. 31, 2020
USD ($)
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| Derivatives not Designated as Hedging Instruments | Other income (expense), net | Fuel contracts | |
| Derivative Instruments Gain Loss [Line Items] | |
| Amount of Gain (Loss) Recognized in Income | $ 20,932 |
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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. 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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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