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Debt (Institutional secured term & secured portfolio loans) (Details) - Secured $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) aircraft
Institutional secured term loans & secured portfolio loans
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	183
Credit facility amount outstanding | $	$ 6,989,633
Weighted average interest rate	2.64%
Hyperion
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	58
Credit facility amount outstanding | $	$ 1,050,000
Weighted average interest rate	2.00%
Celtago & Celtago II
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	25
Credit facility amount outstanding | $	$ 984,076
Weighted average interest rate	2.78%
Cesium
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	15
Credit facility amount outstanding | $	$ 791,480
Weighted average interest rate	2.80%
Goldfish
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	13
Credit facility amount outstanding | $	$ 671,060
Weighted average interest rate	1.65%
Scandium
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	10
Credit facility amount outstanding | $	$ 627,555
Weighted average interest rate	3.16%
Rhodium
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	11
Credit facility amount outstanding | $	$ 551,209
Weighted average interest rate	2.98%
Other secured facilities
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	51
Credit facility amount outstanding | $	$ 2,314,253
Weighted average interest rate	2.88%

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Debt Instrument, Aircraft Collateral Number

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Weighted average interest rate of debt outstanding.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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