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Commitments and Contingencies (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) aircraft | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Future minimum rental payments required under operating leases |  |  |
2017 | $ 191,292 |  |
2018 | 155,799 |  |
2019 | 123,308 |  |
2020 | 135,386 |  |
2021 | 112,535 |  |
Thereafter | 236,503 |  |
Total future lease obligations | $ 954,823 |  |
Number of aircraft leased by the entity | aircraft | 415 |  |
Rental expense for non-cancelable aircraft operating leases | $ 262,602 | $ 273,696 | $ 305,334
Minimum rental expense for airport station rents | $ 31,400 | $ 35,100 | $ 29,000
Maximum |  |  |
Future minimum rental payments required under operating leases |  |  |
Lease contract term (in years) | 9 years |  |

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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition 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 next 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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