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Number of Offlease Aircraft Marketed for Lease

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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Lease Rental Revenues and Flight Equipment Held for Lease (Details 3) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) Aircraft	Mar. 31, 2019 USD ($)	Dec. 31, 2019 Aircraft	Sep. 30, 2019 Aircraft	Dec. 31, 2018 Aircraft
Revenues from External Customers and Long-Lived Assets [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment \| $	$ 27,049	$ 12,002
Revenue \| $	$ 198,920	181,234
Number of Aircraft	274		278
Number of Offlease Aircraft Marketed for Lease or Sale			3
Number of Offlease Aircraft Marketed for Lease	5
INDONESIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment \| $	$ 14,987
SOUTH AFRICA
Revenues from External Customers and Long-Lived Assets [Line Items]
Advanced lease rentals taken into income \| $	5,863
Security Deposits taken into income \| $	$ 8,740
Asia and Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	89		94
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	100		99
Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	40		40
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	26		26
Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	14		16
Geographic Concentration Risk \| Total Revenue \| INDONESIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue \| $	$ 30,113	$ 0
Percentage of geographic concentration	11.00%	0.00%
Geographic Concentration Risk \| Total Revenue \| SOUTH AFRICA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue \| $	$ 57,336	$ 0
Percentage of geographic concentration	20.00%	0.00%
Geographic Concentration Risk \| Net Book Value
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	100.00%		100.00%
Geographic Concentration Risk \| Net Book Value \| Asia and Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	37.00%		38.00%
Geographic Concentration Risk \| Net Book Value \| Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	27.00%		26.00%
Geographic Concentration Risk \| Net Book Value \| Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	13.00%		13.00%
Geographic Concentration Risk \| Net Book Value \| North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	15.00%		15.00%
Geographic Concentration Risk \| Net Book Value \| Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	6.00%		7.00%
Geographic Concentration Risk \| Net Book Value \| Off Lease
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	2.00%		1.00%
Maintenance revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax \| $	$ 46,552	$ 16,401
Maintenance revenue \| SOUTH AFRICA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax \| $	$ 38,804
A-320-200 [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Offlease Aircraft with Future Lease Commitments				1	1
A-330-200 [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Offlease Aircraft with Future Lease Commitments	1
Number of Offlease Aircraft Marketed for Lease or Sale	1
Number of Offlease Aircraft Marketed for Lease			1
B-737-800 [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Offlease Aircraft Marketed for Lease or Sale	2
Number of Offlease Aircraft Marketed for Lease			1