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Leases (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 USD ($) | Dec. 31, 2021 USD ($) aircraft | Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Operating lease right-of-use assets |  | $ 238,516 | $ 282,362
Current maturities of lease liabilities |  | 78,886 | 82,641
Noncurrent operating leases |  | 158,274 | 205,845
Operating leases |  | $ 84,700 |
Weighted-average remaining lease term for operating leases |  | 6 years 3 months 18 days |
Weighted-average discount rate for operating leases |  | 6.00% |
Lease costs |  |  |
Operating lease cost |  | $ 89,891 | 94,915
Variable and short-term lease cost |  | 4,468 | 4,619
Sublease income |  | (6,552) | (6,304)
Total lease cost |  | 87,807 | $ 93,230
CRJ 900 |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Impairment charges |  | $ 84,592 |
Aircraft |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of aircraft acquired | aircraft |  | 43 |
Impairment charges | $ 13,100 |  |
Aircraft | Minimum [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease term |  | 2 years |
Aircraft | Maximum [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease term |  | 9 years |
Airport Facilities | Minimum [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease term |  | 1 month |
Airport Facilities | Maximum [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease term |  | 35 years |

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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