Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Lease revenue (Details)

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Lease revenue (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Lease Revenue [Abstract]  
Term of operating lease agreements 14 years
2018 $ 3,964,268
2019 3,497,545
2020 3,021,796
2021 2,704,523
2022 2,408,034
Thereafter 8,546,457
Contracted minimum future lease receivables $ 24,142,623