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v3.19.3

Leases, Commitments and Contingencies - Leases (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Sep. 30, 2019 USD ($) aircraft | Mar. 31, 2019 USD ($) aircraft | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) aircraft | Sep. 30, 2018 USD ($) | Dec. 31, 2016 item
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of aircraft leased | aircraft |  |  |  |  | 91 |  |
Operating lease right-of-use assets |  | $ 326,700 |  |  | $ 326,700 |  |
Current maturities of lease liabilities |  | 87,472 |  |  | 87,472 |  |
Noncurrent operating leases |  | $ 254,258 |  |  | 254,258 |  |
Operating leases |  |  |  |  | $ 58,600 |  |
Weighted-average remaining lease term: Operating leases |  | 6 years 9 months |  |  | 6 years 9 months |  |
Weighted-average discount rate: Operating leases |  | 6.40% |  |  | 6.40% |  |
Lease costs |  |  |  |  |  |  |
Operating lease cost |  | $ 25,173 |  | $ 42,286 | $ 80,041 | $ 140,544 |
Variable and short-term lease cost |  | 1,343 |  | 1,184 | 4,164 | 3,996 |
Sublease income |  | (357) |  |  | (357) |  |
Total lease cost |  | $ 26,159 |  | $ 43,470 | $ 83,848 | $ 144,540 |
CRJ 200 |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of seats on aircraft | item |  |  |  |  |  |  | 50
Aircraft |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of aircraft acquired | aircraft |  | 4 | 52 |  |  |  |
Payments for acquired aircraft |  | $ 30,000 | $ 111,700 |  |  |  |
Impairment adjustment on retained earnings | $ 13,100 |  |  |  |  |  |
Aircraft | Minimum |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Remaining lease term |  |  |  |  | 1 year |  |
Aircraft | Maximum |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Remaining lease term |  |  |  |  | 10 years |  |
Airport Facilities | Minimum |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Remaining lease term |  |  |  |  | 1 month |  |
Airport Facilities | Maximum |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Remaining lease term |  |  |  |  | 37 years |  |

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