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Fair value of financial instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI |  | $ 25,135 |  | $ 30,607
Total derivative financial instrument used for hedging - receivable |  | 13,338 |  | 9,352
Total financial assets at fair value |  | 38,473 |  | 39,959
Total financial instruments at FVTPL |  | 0 |  | 24
Total derivative financial instruments used for hedging - payable |  | 34,943 |  | 59,686
Total financial liabilities at fair value |  | 34,943 |  | 59,710
Level 1 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [1] | 25,135 |  | 27,821
Total derivative financial instrument used for hedging - receivable | [1] | 0 |  | 0
Total financial assets at fair value | [1] | 25,135 |  | 27,821
Total financial instruments at FVTPL | [1] |  |  | 0
Total derivative financial instruments used for hedging - payable | [1] | 0 |  | 0
Total financial liabilities at fair value | [1] | 0 |  | 0
Level 2 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [2] | 0 |  | 2,786
Total derivative financial instrument used for hedging - receivable | [2] | 13,338 |  | 9,352
Total financial assets at fair value | [2] | 13,338 |  | 12,138
Total financial instruments at FVTPL | [2] |  |  | 24
Total derivative financial instruments used for hedging - payable | [2] | 34,943 |  | 59,686
Total financial liabilities at fair value | [2] | 34,943 |  | 59,710
Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [3] | 0 |  | 0
Total derivative financial instrument used for hedging - receivable | [3] | 0 |  | 0
Total financial assets at fair value | [3] | 0 |  | 0
Total financial instruments at FVTPL | [3] |  |  | 0
Total derivative financial instruments used for hedging - payable | [3] | 0 |  | 0
Total financial liabilities at fair value | [3] | 0 |  | 0
Interest rate swaps [Member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable |  | 129 |  | 363
Total derivative financial instruments used for hedging - payable |  | 4,789 |  | 3,704
Interest rate swaps [Member] | Level 1 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable | [1] | 0 |  | 0
Total derivative financial instruments used for hedging - payable | [1] | 0 |  | 0
Interest rate swaps [Member] | Level 2 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable | [2] | 129 |  | 363
Total derivative financial instruments used for hedging - payable | [2] | 4,789 |  | 3,704
Interest rate swaps [Member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable | [3] | 0 |  | 0
Total derivative financial instruments used for hedging - payable | [3] | 0 |  | 0
Cross-currency interest rate swaps [Member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable |  | 4,550 |  | 2,561
Total derivative financial instruments used for hedging - payable |  | 30,154 |  | 46,198
Cross-currency interest rate swaps [Member] | Level 1 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable | [1] | 0 |  | 0
Total derivative financial instruments used for hedging - payable | [1] | 0 |  | 0
Cross-currency interest rate swaps [Member] | Level 2 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable | [2] | 4,550 |  | 2,561
Total derivative financial instruments used for hedging - payable | [2] | 30,154 |  | 46,198
Cross-currency interest rate swaps [Member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable | [3] | 0 |  | 0
Total derivative financial instruments used for hedging - payable | [3] | 0 |  | 0
Foreign exchange forward [Member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable |  | 8,659 |  | 6,428
Total financial instruments at FVTPL |  |  |  | 24
Total derivative financial instruments used for hedging - payable |  |  |  | 9,784
Foreign exchange forward [Member] | Level 1 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable | [1] | 0 |  | 0
Total financial instruments at FVTPL | [1] |  |  | 0
Total derivative financial instruments used for hedging - payable | [1] |  |  | 0
Foreign exchange forward [Member] | Level 2 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable | [2] | 8,659 |  | 6,428
Total financial instruments at FVTPL | [2] |  |  | 24
Total derivative financial instruments used for hedging - payable | [2] |  |  | 9,784
Foreign exchange forward [Member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total derivative financial instrument used for hedging - receivable | [3] | 0 |  | 0
Total financial instruments at FVTPL | [3] |  |  | 0
Total derivative financial instruments used for hedging - payable | [3] |  |  | 0
Corporate debt [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI |  |  |  | 13,909
Corporate debt [member] | Level 1 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [1] |  |  | 13,909
Corporate debt [member] | Level 2 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [2] |  |  | 0
Corporate debt [member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [3] |  |  | 0
Sovereign debt [Member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI |  | 16,733 | [4] | 16,698
Sovereign debt [Member] | Level 1 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [1] | 16,733 | [4] | 13,912
Sovereign debt [Member] | Level 2 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [2] | 0 | [4] | 2,786
Sovereign debt [Member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [3] | 0 | [4] | $ 0
Equity investments [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI |  | 8,402 |  |
Equity investments [member] | Level 1 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [1] | 8,402 |  |
Equity investments [member] | Level 2 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [2] | 0 |  |
Equity investments [member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Total securities at fair value through OCI | [3] | $ 0 |  |
[1] | Level 1: Quoted market prices in an active market.
[2] | Level 2: Quoted market prices in an inactive market or internally developed models with significant observable market.
[3] | Level 3: Internally developed models with significant unobservable market information.
[4] | At December 31, 2017, securities at fair value through OCI for $2,955 were reclassified from level 2 to level 1 of the fair value hierarchy given that Bloomberg's valuation "BVAL" for these values increased from 7 (in 2016) to 10 (in 2017).

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