Leases, Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) aircraft	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 223,856		$ 238,516
Current maturities of lease liabilities	78,930		78,886
Noncurrent operating leases	147,994		$ 158,274
Operating leases	$ 14,700
Weighted-average remaining lease term for operating leases	6 years 2 months 12 days
Weighted-average discount rate for operating leases	6.00%
Lease costs
Operating lease cost	$ 21,841	$ 22,127
Variable and short-term lease cost	1,018	1,224
Sublease income	(1,803)	(1,335)
Total lease cost	$ 21,056	$ 22,016
Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft acquired | aircraft	43
Aircraft | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	2 years
Aircraft | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	8 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	34 years