Commitments and Contingent Liabilities - Capital Commitments and Operating Expenditures (Details) $ in Thousands	6 Months Ended
Jun. 30, 2020 USD ($) order purchaseRight
Total Committed Expenditures
Remaining in 2020	$ 139,269
2021	399,096
2022	509,873
2023	312,502
2024	411,570
Thereafter	242,768
Total	2,015,078
Aircraft and aircraft related
Total Committed Expenditures
Remaining in 2020	97,910
2021	315,781
2022	436,659
2023	246,996
2024	354,120
Thereafter	111,502
Total	$ 1,562,968
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	$ 41,359
2021	83,315
2022	73,214
2023	65,506
2024	57,450
Thereafter	131,266
Total	$ 452,110

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