Financial instruments - Fair values and risk management - Schedule of cash flow hedges (Details) - Cash flow hedges - Interest rate risk - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Cash flow hedge reserve	$ 4,583	$ 2,698	$ 0
Changes in the value of the hedging instrument recognized in OCI	(1,885)	(2,698)
1-6 months
Disclosure of detailed information about financial instruments [line items]
Net exposure	$ (23,469)	$ (23,895)
Average fixed interest rate	1.99%	1.95%
6-12 months
Disclosure of detailed information about financial instruments [line items]
Net exposure	$ (23,261)	$ (23,921)
Average fixed interest rate	2.00%	1.95%
More than 1 year
Disclosure of detailed information about financial instruments [line items]
Net exposure	$ (176,598)	$ (199,565)
Average fixed interest rate	2.96%	1.95%
Variable-rate instruments
Disclosure of detailed information about financial instruments [line items]
Change in value used for calculating hedge ineffectiveness	$ 1,205	$ 2,191
Cash flow hedge reserve	(3,396)	(2,191)
Forward cap option
Disclosure of detailed information about financial instruments [line items]
Change in value used for calculating hedge ineffectiveness	680	507
Cash flow hedge reserve	(1,187)	(507)
Nominal amount	200,000	200,000
Carrying amount - Assets	52	725
Carrying amount - Liabilities	0	0
Changes in the value of the hedging instrument recognized in OCI	(680)	(507)
Hedge ineffectiveness recognized in profit or loss	0	(7)
Interest rate swaps
Disclosure of detailed information about financial instruments [line items]
Nominal amount	506,603	707,871
Carrying amount - Assets	5	7,205
Carrying amount - Liabilities	3,593	1,049
Changes in the value of the hedging instrument recognized in OCI	(1,205)	(2,191)
Hedge ineffectiveness recognized in profit or loss	$ (4,943)	$ (2,783)

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The average rate of a hedging instrument. [Refer: Hedging instruments [member]]

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The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

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The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

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A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges]

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