Commitments and Contingencies - Future Minimum Lease Payments Under Noncancelable Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Dec. 31, 2013 leases
Capital Leases, Future Minimum Payments, Net Minimum Payments, Rolling Maturity [Abstract]
Future Minimum Payments Due, Remainder of Fiscal Year	$ 923
Future Minimum Payments Due, 2015	1,244
Future Minimum Payments Due, 2016	1,044
Future Minimum Payments Due, 2017	44
Future Minimum Payments Due, 2018	44
Future Minimum Payments Due, 2019 and thereafter	12
Total minimum lease payments	3,311
Less amount representing interest	324
Present value of minimum lease payments	2,987
Less current portion	1,324
Long term portion	1,663
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Future Minimum Payments Due, Remainder of Fiscal Year	108,559
Future Minimum Payments Due, 2015	214,393
Future Minimum Payments Due, 2016	206,671
Future Minimum Payments Due, 2017	187,643
Future Minimum Payments Due, 2018	161,568
Future Minimum Payments Due, 2019 and thereafter	627,695
Total minimum lease payments	1,506,529
Aircraft and Spare Engine Leases [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Future Minimum Payments Due, Remainder of Fiscal Year	98,287
Future Minimum Payments Due, 2015	197,137
Future Minimum Payments Due, 2016	195,312
Future Minimum Payments Due, 2017	178,811
Future Minimum Payments Due, 2018	155,123
Future Minimum Payments Due, 2019 and thereafter	603,289
Total minimum lease payments	1,427,959
Property Facility Leases [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Future Minimum Payments Due, Remainder of Fiscal Year	10,272
Future Minimum Payments Due, 2015	17,256
Future Minimum Payments Due, 2016	11,359
Future Minimum Payments Due, 2017	8,832
Future Minimum Payments Due, 2018	6,445
Future Minimum Payments Due, 2019 and thereafter	24,406
Total minimum lease payments	$ 78,570
Quick Engine Change Kit [Member]
Capital Leased Assets [Line Items]
Number of Capital Leases		2
Capital Leases of Lessee, Lease Term	3 years

Capital Leases of Lessee, Lease Term

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The number of units (items of property) under capital lease arrangements.

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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Amount of minimum lease payments for capital leases due in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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-Name Accounting Standards Codification

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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