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Commitments and contingencies (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Commitments and contingencies [Line Items]
Minimum lease payments receivable under non-cancellable operating lease	$ 263,859	$ 324,877
Unearned finance income on finance lease	(22,206)	(43,001)
Minimum finance lease payments receivable, at present value	241,653	281,876
Not later than one year [member]
Disclosure of Commitments and contingencies [Line Items]
Minimum lease payments receivable under non-cancellable operating lease	53,607	56,915
Unearned finance income on finance lease	41,634	40,224
Later than one year and not later than five years [member]
Disclosure of Commitments and contingencies [Line Items]
Minimum lease payments receivable under non-cancellable operating lease	210,252	267,962
Unearned finance income on finance lease	$ 200,019	$ 241,652

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The present value of minimum finance lease payments receivable. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2018-03-02&anchor=para_47_a&doctype=Standard&book=b
-URIDate 2018-03-16

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The amount of future minimum lease payments receivable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2018-01-01
-Paragraph 56
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2018-03-02&anchor=para_56_a&doctype=Standard&book=b
-URIDate 2018-03-16

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The difference for a finance lease between: (a) the gross investment in the lease, and (b) the net investment in the lease. The gross investment in the lease is the aggregate of: (a) the minimum lease payments receivable by the lessor under a finance lease; and (b) any unguaranteed residual value accruing to the lessor. The net investment in the lease is the gross investment in the lease discounted at the interest rate implicit in the lease. [Refer: Finance income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
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-IssueDate 2018-01-01
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-URIDate 2018-03-16

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