Lease Rental Revenues and Flight Equipment Held for Lease (Details 4) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) Aircraft	Dec. 31, 2016 USD ($) Aircraft
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Book Value \| $	$ 6,188,469	$ 6,247,585
Number of Aircraft	224	193
A321-200
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Offlease Aircraft Marketed for Lease	1	2
A-330-200 [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Offlease Aircraft Marketed for Lease		1
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	92	66
Asia and Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	59	61
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	32	26
South America
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	25	23
Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	15	14
Off-lease
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Aircraft	1	3
Geographic Concentration Risk \| Leased Assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	100.00%	100.00%
Geographic Concentration Risk \| Leased Assets \| Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	32.00%	23.00%
Geographic Concentration Risk \| Leased Assets \| Asia and Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	30.00%	38.00%
Geographic Concentration Risk \| Leased Assets \| North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	10.00%	8.00%
Geographic Concentration Risk \| Leased Assets \| South America
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	19.00%	18.00%
Geographic Concentration Risk \| Leased Assets \| Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	9.00%	11.00%
Geographic Concentration Risk \| Leased Assets \| Off-lease
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of geographic concentration	0.00%	2.00%

Number of Offlease Aircraft Marketed for Lease

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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- Definition

The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718

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- Definition

The number of units (items of property) under operating lease arrangements.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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