Commitments and Contingent Liabilities - Capital Commitments and Operating Expenditures (Details) $ in Thousands	9 Months Ended
Sep. 30, 2020 USD ($) purchaseRight order
Total Committed Expenditures
Remaining in 2020	$ 45,972
2021	399,525
2022	518,383
2023	317,801
2024	423,876
Thereafter	251,173
Total	1,956,730
Aircraft and aircraft related
Total Committed Expenditures
Remaining in 2020	32,280
2021	325,876
2022	445,457
2023	250,392
2024	364,609
Thereafter	115,247
Total	$ 1,533,861
Aircraft and aircraft related \| B787-9 spare engines
Long-term Purchase Commitment [Line Items]
Number of aircraft, firm orders \| order	2
Number of aircraft purchase rights \| purchaseRight	2
Aircraft and aircraft related \| A321neo aircraft
Long-term Purchase Commitment [Line Items]
Number of aircraft, firm orders \| order	0
Number of aircraft purchase rights \| purchaseRight	9
Aircraft and aircraft related \| B787-9 aircraft
Long-term Purchase Commitment [Line Items]
Number of aircraft, firm orders \| order	10
Number of aircraft purchase rights \| purchaseRight	10
Other
Total Committed Expenditures
Remaining in 2020	$ 13,692
2021	73,649
2022	72,926
2023	67,409
2024	59,267
Thereafter	135,926
Total	$ 422,869

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