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Geographic information (Lease revenues by individual countries) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total lease revenue	$ 4,321,006	$ 4,682,266
Total lease revenue			$ 4,537,093
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]
Total lease revenue	$ 835,317	$ 874,145
Total lease revenue			$ 639,316
China | Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	19.30%	18.70%	14.10%
United States
Segment Reporting Information [Line Items]
Total lease revenue	$ 502,976	$ 511,676
Total lease revenue			$ 528,687
United States | Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	11.60%	10.90%	11.60%
Other countries
Segment Reporting Information [Line Items]
Total lease revenue	$ 2,982,713	$ 3,296,445
Total lease revenue			$ 3,369,090
Other countries | Geographic Concentration Risk | Total Lease Revenue
Segment Reporting Information [Line Items]
Percentage of lease revenue	69.10%	70.40%	74.30%

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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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