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Leases, Commitments and Contingencies - Leases (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) aircraft | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) aircraft | Jun. 30, 2018 USD ($) | Dec. 31, 2016 item | Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Number of aircraft leased | aircraft |  |  |  |  | 92 |  |  |
Transition adjustment, net of tax |  |  |  |  |  |  |  | $ (13,141)
Operating lease right-of-use assets |  | $ 336,703 |  |  | $ 336,703 |  |  |
Current maturities of lease liabilities |  | 81,796 |  |  | 81,796 |  |  |
Noncurrent operating leases |  | $ 265,516 |  |  | 265,516 |  |  |
Operating leases |  |  |  |  | $ 43,100 |  |  |
Weighted-average remaining lease term: Operating leases |  | 6 years 6 months |  |  | 6 years 6 months |  |  |
Weighted-average discount rate: Operating leases |  | 6.40% |  |  | 6.40% |  |  |
Lease costs |  |  |  |  |  |  |  |
Operating lease cost |  | $ 27,647 |  | $ 45,425 | $ 54,868 | $ 98,258 |  |
Variable and short-term lease cost |  | 1,346 |  | 1,392 | 2,821 | 2,811 |  |
Total lease cost |  | $ 28,993 |  | $ 46,817 | $ 57,689 | $ 101,069 |  |
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 |  |  | 52 |  |  |  |  |
Payments for acquired aircraft |  |  | $ 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 |  |  |  |  | 9 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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