Fair Value Measurements - Schedule of Financial Assets and Liabilities, Recurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Fair Value Measurements
Short-term investments	$ 442,106	$ 245,599
Recurring basis
Fair Value Measurements
Cash equivalents	307,500	216,491
Short-term investments	442,106	245,599
Total assets measured at fair value	749,910	472,392
Total liabilities measured at fair value	712	593
Recurring basis \| Fuel derivative contracts
Fair Value Measurements
Derivative assets	39	5,878
Recurring basis \| Foreign currency derivatives
Fair Value Measurements
Derivative assets	265	4,424
Foreign currency derivatives	712	593
Recurring basis \| Level 1
Fair Value Measurements
Cash equivalents	300,337	205,943
Short-term investments	0	0
Total assets measured at fair value	300,337	205,943
Total liabilities measured at fair value	0	0
Recurring basis \| Level 1 \| Fuel derivative contracts
Fair Value Measurements
Derivative assets	0	0
Recurring basis \| Level 1 \| Foreign currency derivatives
Fair Value Measurements
Derivative assets	0	0
Foreign currency derivatives	0	0
Recurring basis \| Level 2
Fair Value Measurements
Cash equivalents	7,163	10,548
Short-term investments	442,106	245,599
Total assets measured at fair value	449,573	266,449
Total liabilities measured at fair value	712	593
Recurring basis \| Level 2 \| Fuel derivative contracts
Fair Value Measurements
Derivative assets	39	5,878
Recurring basis \| Level 2 \| Foreign currency derivatives
Fair Value Measurements
Derivative assets	265	4,424
Foreign currency derivatives	712	593
Recurring basis \| Level 3
Fair Value Measurements
Cash equivalents	0	0
Short-term investments	0	0
Total assets measured at fair value	0	0
Total liabilities measured at fair value	0	0
Recurring basis \| Level 3 \| Fuel derivative contracts
Fair Value Measurements
Derivative assets	0	0
Recurring basis \| Level 3 \| Foreign currency derivatives
Fair Value Measurements
Derivative assets	0	0
Foreign currency derivatives	$ 0	0
Corporate debt securities
Fair Value Measurements
Maximum remaining maturity of short-term investments	2 years
Corporate debt securities \| Recurring basis
Fair Value Measurements
Short-term investments	$ 201,198	100,713
Corporate debt securities \| Recurring basis \| Level 1
Fair Value Measurements
Short-term investments	0	0
Corporate debt securities \| Recurring basis \| Level 2
Fair Value Measurements
Short-term investments	201,198	100,713
Corporate debt securities \| Recurring basis \| Level 3
Fair Value Measurements
Short-term investments	$ 0	0
U.S. government and agency securities
Fair Value Measurements
Maximum remaining maturity of short-term investments	2 years
U.S. government and agency securities \| Recurring basis
Fair Value Measurements
Short-term investments	$ 190,908	75,481
U.S. government and agency securities \| Recurring basis \| Level 1
Fair Value Measurements
Short-term investments	0	0
U.S. government and agency securities \| Recurring basis \| Level 2
Fair Value Measurements
Short-term investments	190,908	75,481
U.S. government and agency securities \| Recurring basis \| Level 3
Fair Value Measurements
Short-term investments	$ 0	0
Other fixed income securities
Fair Value Measurements
Maximum remaining maturity of short-term investments	1 year
Other fixed income securities \| Recurring basis
Fair Value Measurements
Short-term investments	$ 50,000	69,405
Other fixed income securities \| Recurring basis \| Level 1
Fair Value Measurements
Short-term investments	0	0
Other fixed income securities \| Recurring basis \| Level 2
Fair Value Measurements
Short-term investments	50,000	69,405
Other fixed income securities \| Recurring basis \| Level 3
Fair Value Measurements
Short-term investments	$ 0	$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of financial and nonfinancial obligations.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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