Leases Narrative (Details)	3 Months Ended	6 Months Ended
	Mar. 31, 2020 aircraft	Jun. 30, 2020 USD ($) aircraft aircraft_engine	Dec. 31, 2019 USD ($) a residentialUnits
Lessee, Lease, Description [Line Items]
Number of aircraft held		154
Number of spare engines capitalized		16
Area of land | a			8.5
Land | $			$ 41,000,000.0
Number of residential units | residentialUnits			200
Operating lease not yet commenced, amount | $		$ 2,600,000
Operating lease not yet commenced, amount, year two | $		$ 0
Aircraft
Lessee, Lease, Description [Line Items]
Number of capitalized aircraft or engine purchased off lease		29
A320 Family | Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft capitalized		99
Airbus A319
Lessee, Lease, Description [Line Items]
Number of aircraft to be purchased from finance lease	2
Aircraft
Lessee, Lease, Description [Line Items]
Number of delivered aircraft financed with debt		6
Number of previously leased aircraft or engine purchased off lease		2
Aircraft | Minimum
Lessee, Lease, Description [Line Items]
Operating leases, term		8 years
Aircraft | Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term		18 years
Aircraft | A320 Family
Lessee, Lease, Description [Line Items]
Number of leased assets financed under operating leases		55
Other Leased Equipment and Property
Lessee, Lease, Description [Line Items]
Operating leases, term			99 years
Area of land | a			2.6
Other Leased Equipment and Property | Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term		99 years
Spare Engines
Lessee, Lease, Description [Line Items]
Number of leased assets financed under operating leases | aircraft_engine		8
Number of spare engines purchased | aircraft_engine		2
Number Of spare engines returned | aircraft_engine		1
Leased Computer And Office Equipment | Minimum
Lessee, Lease, Description [Line Items]
Finance leases, term		4 years
Leased Computer And Office Equipment | Maximum
Lessee, Lease, Description [Line Items]
Finance leases, term		5 years
Third Party Lessor
Lessee, Lease, Description [Line Items]
Number of delivered leased aircraft		3