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Financial instruments - Derivatives - Interest rate swaps (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Receive floating |  |
Total carrying amount (notional amount) | $ 402,049 | $ 75,542
Total carrying amount (fair value) | $ 5,736 | $ 545
Swap expires Jun. 29, 2018 1 [Member] |  |
Receive floating |  |
Fixed Interest Rate |  | 3.315%
Notional amount |  | $ 19,396
Fair Value |  | $ 156
Swap expires Jun. 29, 2018 2 [Member] |  |
Receive floating |  |
Fixed Interest Rate |  | 3.565%
Notional amount |  | $ 20,417
Fair Value |  | $ 187
Swap expires Jun. 29, 2018 3 [Member] |  |
Receive floating |  |
Fixed Interest Rate |  | 2.865%
Notional amount |  | $ 35,729
Fair Value |  | $ 202
Swap expires Apr. 20, 2023 1 [Member] |  |
Receive floating |  |
Fixed Interest Rate | 2.987% |
Notional amount | $ 46,800 |
Fair Value | $ 699 |
Swap expires Apr. 20, 2023 2 [Member] |  |
Receive floating |  |
Fixed Interest Rate | 3.012% |
Notional amount | $ 46,800 |
Fair Value | $ 743 |
Swap expires Sept. 29, 2023 1 [Member] |  |
Receive floating |  |
Fixed Interest Rate | 3.019% |
Notional amount | $ 35,877 |
Fair Value | $ 580 |
Swap expires Sept. 29, 2023 2 [Member] |  |
Receive floating |  |
Fixed Interest Rate | 3.019% |
Notional amount | $ 34,963 |
Fair Value | $ 563 |
Swap expires Jul. 24, 2023 [Member] |  |
Receive floating |  |
Fixed Interest Rate | 2.8715% |
Notional amount | $ 51,400 |
Fair Value | $ 606 |
Swap expires Jun. 30, 2023 [Member] |  |
Receive floating |  |
Fixed Interest Rate | 2.8785% |
Notional amount | $ 45,807 |
Fair Value | $ 503 |
Swap expires Sept. 29, 2023 3 [Member] |  |
Receive floating |  |
Fixed Interest Rate | 2.895% |
Notional amount | $ 50,115 |
Fair Value | $ 653 |
Swap expires Sept. 30, 2023 [Member] |  |
Receive floating |  |
Fixed Interest Rate | 2.897% |
Notional amount | $ 45,986 |
Fair Value | $ 597 |
Swap expires Sept. 29, 2023 4 [Member] |  |
Receive floating |  |
Fixed Interest Rate | 3.02% |
Notional amount | $ 44,301 |
Fair Value | $ 793 |

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Fixed interest rate related to the swap. + References No definition available. + Details
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Balance Type: | na
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- Definition Description of swaps which have a "receive floating" interest rate structure. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the swap(s). Expressed as an absolute value. + References No definition available. + Details
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- Definition The total of the aggregate notional amount specified by the swap(s). Expressed as an absolute value. + References No definition available. + Details
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- Definition The amount of financial liabilities that meet either of the following conditions: (a) they meet the definition of held for trading; or (b) upon initial recognition they are designated by the entity as at fair value through profit or loss. An entity may use this designation only when permitted by paragraph 4.3.5 of IFRS 9 (embedded derivatives) or when doing so results in more relevant information, because either: (a) it eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognising the gains and losses on them on different bases; or (b) a group of financial liabilities or financial assets and financial liabilities is managed and its performance is evaluated on a fair value basis, in accordance with a documented risk management or investment strategy, and information about the group is provided internally on that basis to the entity’s key management personnel (as defined in IAS 24). [Refer: At fair value [member]; Key management personnel of entity or parent [member]; Derivatives [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_e&doctype=Standard -URIDate 2017-03-09 + Details
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