Condensed Statements Of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income	$ 69,002us-gaap_NetIncomeLoss	$ 37,706us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operations:
Unrealized (gains) losses on open fuel derivative contracts	(3,783)	0
Equity-based compensation, net	1,985us-gaap_ShareBasedCompensation	2,547us-gaap_ShareBasedCompensation
Allowance for doubtful accounts (recoveries)	31	(13)
Amortization of deferred gains and losses	164	(89)
Depreciation and amortization	14,863us-gaap_DepreciationAndAmortization	11,121us-gaap_DepreciationAndAmortization
Deferred income tax expense (benefit)	(5,560)us-gaap_DeferredIncomeTaxExpenseBenefit	410us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on disposal of assets	595us-gaap_GainLossOnDispositionOfAssets	150us-gaap_GainLossOnDispositionOfAssets
Capitalized interest	(2,533)	(107)
Changes in operating assets and liabilities:
Accounts receivable	(5,444)	(10,656)
Prepaid maintenance reserves	(12,317)	(14,661)
Long-term deposits and other assets	(6,160)	(15,691)
Accounts payable	433	1,457
Air traffic liability	79,350	62,328
Other liabilities	29,643	16,137
Net cash provided by operating activities	167,835	90,639
Investing activities:
Pre-delivery deposits for flight equipment, net of refunds	(50,388)	(73,201)
Purchase of property and equipment	(184,609)	(4,086)
Net cash used in investing activities	(234,997)	(77,287)
Financing activities:
Proceeds from issuance of long-term debt	185,000	0
Proceeds from stock options exercised	15	39
Payments on debt and capital lease obligations	(2,968)	0
Excess tax benefits from equity-based compensation	7,877	588
Repurchase of common stock	(10,943)	(621)
Debt issuance costs	2,976us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Net cash provided by financing activities	176,005	6
Net increase in cash and cash equivalents	108,843	13,358
Cash and cash equivalents at beginning of period	632,784	530,631
Cash and cash equivalents at end of period	741,627	543,989
Cash payments for:
Interest (net of capitalized interest)	11us-gaap_InterestPaidNet	0us-gaap_InterestPaidNet
Taxes	$ 9,883us-gaap_IncomeTaxesPaid	$ 3,218us-gaap_IncomeTaxesPaid

Amortization of Deferred Gains and (Losses) from Sale Leaseback Transactions.

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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration