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Debt (Institutional secured term & secured portfolio loans) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) aircraft
Debt Instrument [Line Items]
Commitment	$ 37,554,097
Undrawn lines of credit	8,061,016
Secured
Debt Instrument [Line Items]
Commitment	14,079,999
Undrawn lines of credit	$ 3,145,016
Secured | Institutional secured term loans & secured portfolio loans
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	280
Commitment	$ 9,097,528
Undrawn lines of credit	1,564,500
Credit facility amount outstanding	$ 7,533,028
Weighted average interest rate	4.28%
Secured | Hyperion
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	94
Commitment	$ 1,500,000
Undrawn lines of credit	0
Credit facility amount outstanding	$ 1,500,000
Weighted average interest rate	4.55%
Secured | Vancouver
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	56
Commitment	$ 750,000
Undrawn lines of credit	0
Credit facility amount outstanding	$ 750,000
Weighted average interest rate	4.55%
Secured | Scandium
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	7
Commitment	$ 772,981
Undrawn lines of credit	173,500
Credit facility amount outstanding	$ 599,481
Weighted average interest rate	4.37%
Secured | Temescal
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	49
Commitment	$ 666,969
Undrawn lines of credit	0
Credit facility amount outstanding	$ 666,969
Weighted average interest rate	4.76%
Secured | Celtago
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	13
Commitment	$ 659,203
Undrawn lines of credit	0
Credit facility amount outstanding	$ 659,203
Weighted average interest rate	3.37%
Secured | Celtago II
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	13
Commitment	$ 580,736
Undrawn lines of credit	0
Credit facility amount outstanding	$ 580,736
Weighted average interest rate	3.90%
Secured | BlowFishFunding
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	9
Commitment	$ 533,108
Undrawn lines of credit	0
Credit facility amount outstanding	$ 533,108
Weighted average interest rate	4.34%
Secured | Iridium
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	8
Commitment	$ 519,111
Undrawn lines of credit	0
Credit facility amount outstanding	$ 519,111
Weighted average interest rate	4.11%
Secured | Other secured facilities
Debt Instrument [Line Items]
Number of aircraft designated as collateral | aircraft	31
Commitment	$ 3,115,420
Undrawn lines of credit	1,391,000
Credit facility amount outstanding	$ 1,724,420
Weighted average interest rate	4.20%

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Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity

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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.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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