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Lease revenue (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Lease Revenue [Abstract]  
Term of operating lease agreements 15 years
2020 $ 4,106,827
2021 3,870,189
2022 3,615,500
2023 3,348,230
2024 3,016,714
Thereafter 10,848,862
Contracted minimum future lease receivables $ 28,806,322