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Geographic information (Lease revenues by individual countries) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Lease revenue	$ 4,682,266
Lease revenue		$ 4,537,093	$ 4,713,802
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	$ 874,145
Lease revenue		$ 639,316	$ 648,343
China | Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	18.70%	14.10%	13.80%
United States
Segment Reporting Information [Line Items]
Lease revenue	$ 511,676
Lease revenue		$ 528,687	$ 568,999
United States | Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	10.90%	11.60%	12.10%
Other Countries
Segment Reporting Information [Line Items]
Lease revenue	$ 3,296,445
Lease revenue		$ 3,369,090	$ 3,496,460
Other Countries | Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	70.40%	74.30%	74.10%

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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.

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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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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