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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of Fair Values of Financial Instruments and Nonfinancial Assets and Liabilities Measured at the Reporting Date

The fair values of these financial instruments are summarized as follows:


				Fair Value at
		Fair Value
		Hierarchy		December 31, 2022								December 31, 2021
		Levels		Assets				Liabilities				Assets				Liabilities

Derivatives designated as cash flow hedging instruments:
Fuel hedge contracts		2		$	—			$	638			$	630			$	—
Foreign currency exchange hedge contracts		2			831				6				—				—
Total derivatives				$	831			$	644			$	630			$	—

Changes in Components of Accumulated Other Comprehensive Income (Loss)

Changes in the components of the accumulated balances of other comprehensive income (loss) are as follows:


					2022				2021				2020
Derivatives:
Fuel Hedge Contracts
Reclassification of derivative (gains) losses to earnings—net of tax				$	(10,629	)		$	(6,481	)		$	5,825
Change in fair value of derivatives—net of tax					9,681				5,653				(5,152	)
Net change in cash flow derivative fuel hedges—net of tax				$	(948	)		$	(828	)		$	673

Foreign Currency Exchange Hedge Contracts
Reclassification of derivative (gains) losses to earnings—net of tax				$	116			$	—			$	—
Change in fair value of derivatives—net of tax					501				—				—
Net change in cash flow derivative foreign currency hedges—net of tax					617				—				—
Total net change in cash flow derivative hedges—net of tax				$	(331	)		$	(828	)		$	673

Adjustments Reclassified from Accumulated Balances Other Comprehensive Income (Loss) to Earnings

Adjustments reclassified from accumulated balances of other comprehensive income (loss) to earnings are as follows:


		Statements operations location			2022				2021				2020
Derivatives:
		Costs of contract revenues		$	(14,219	)		$	(8,670	)		$	7,703
		Income tax (provision) benefit			(3,590	)			(2,189	)			1,878
				$	(10,629	)		$	(6,481	)		$	5,825