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Geographic information (Lease revenues by individual countries) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Lease revenue	$ 4,713,802	$ 4,867,623	$ 4,991,551
Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	100.00%	100.00%	100.00%
China
Segment Reporting Information [Line Items]
Lease revenue	$ 648,343	$ 669,859	$ 656,809
China | Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	13.80%	13.80%	13.20%
United States
Segment Reporting Information [Line Items]
Lease revenue	$ 568,999	$ 535,526	$ 538,686
United States | Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	12.10%	11.00%	10.80%
Ireland
Segment Reporting Information [Line Items]
Lease revenue	$ 120,500	$ 117,259	$ 58,571
Ireland | Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	2.60%	2.40%	1.20%
Other Countries
Segment Reporting Information [Line Items]
Lease revenue	$ 3,375,960	$ 3,544,979	$ 3,737,485
Other Countries | Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	71.50%	72.80%	74.80%

X

- 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=64851502&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=73719730&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=64851502&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=73719730&loc=d3e13537-108611

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707

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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

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