Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Effects of Derivatives Not Designated as Hedging Instruments on Consolidated Statements of Operations (Details)

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Fair Value Measurements and Derivatives - Effects of Derivatives Not Designated as Hedging Instruments on Consolidated Statements of Operations (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
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