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Financial instruments (Details 30) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss $ 310 $ 639
Interest Rate Risk [Member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 302 623
Foreign exchange risk [member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 8 16
USD OIS [Member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 14 44
USD OIS [Member] | Interest Rate Risk [Member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 22 19
USD OIS [Member] | Foreign exchange risk [member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss (8) 25
Tenor [Member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 296 0
Tenor [Member] | Interest Rate Risk [Member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 296 0
Tenor [Member] | Foreign exchange risk [member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 0 0
Xccy basis [Member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 17 (4)
Xccy basis [Member] | Interest Rate Risk [Member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 0 0
Xccy basis [Member] | Foreign exchange risk [member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 17 (4)
Credit spread [Member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss (17) 599
Credit spread [Member] | Interest Rate Risk [Member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss (16) 604
Credit spread [Member] | Foreign exchange risk [member]    
Disclosure of financial instruments [Line Items]    
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss $ (1) $ (5)