Fair Value Measurements - Schedule of Financial Assets and Liabilities, Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value Measurements
Short-term investments	$ 265,059	$ 284,075
Recurring basis
Fair Value Measurements
Cash equivalents	369,665	123,120
Restricted cash	1,000	5,000
Short-term investments	265,059	284,075
Total assets measured at fair value	644,587	440,191
Total liabilities measured at fair value	3,758	1,469
Recurring basis \| Crude oil call options
Fair Value Measurements
Derivative contracts	3,254	8,489
Recurring basis \| Jet fuel swaps
Fair Value Measurements
Derivative contracts	84	6,601
Derivative contracts	488
Recurring basis \| Foreign Currency Derivatives
Fair Value Measurements
Derivative contracts	5,525	12,906
Derivative contracts	3,270	1,469
Recurring basis \| Level 1
Fair Value Measurements
Cash equivalents	332,567	104,113
Restricted cash	1,000	5,000
Total assets measured at fair value	333,567	109,113
Recurring basis \| Level 2
Fair Value Measurements
Cash equivalents	37,098	19,007
Short-term investments	265,059	284,075
Total assets measured at fair value	311,020	331,078
Total liabilities measured at fair value	3,758	1,469
Recurring basis \| Level 2 \| Crude oil call options
Fair Value Measurements
Derivative contracts	3,254	8,489
Recurring basis \| Level 2 \| Jet fuel swaps
Fair Value Measurements
Derivative contracts	84	6,601
Derivative contracts	488
Recurring basis \| Level 2 \| Foreign Currency Derivatives
Fair Value Measurements
Derivative contracts	5,525	12,906
Derivative contracts	$ 3,270	$ 1,469

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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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.

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Fair value of financial and nonfinancial obligations.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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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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