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Financial instruments (Details 25) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Nominal Amount $ 1,527,117 $ 2,218,625
Carrying amount of the hedging instrument, Asset 13,338 9,352
Carrying amount of the hedging instrument, Liability (34,943) (59,686)
Changes in fair value used for calculating hedge ineffectiveness 28,649 (27,640)
Interest rate swaps | Fair value hedges:    
Disclosure of financial instruments [Line Items]    
Nominal Amount 367,500 796,202
Carrying amount of the hedging instrument, Asset 0 40
Carrying amount of the hedging instrument, Liability (4,361) (2,005)
Changes in fair value used for calculating hedge ineffectiveness (2,394) (2,199)
Interest rate swaps | Cash flow hedges:    
Disclosure of financial instruments [Line Items]    
Nominal Amount 595,000 752,000
Carrying amount of the hedging instrument, Asset 127 323
Carrying amount of the hedging instrument, Liability (428) (1,699)
Changes in fair value used for calculating hedge ineffectiveness 995 696
Cross-currency interest rate swaps | Fair value hedges:    
Disclosure of financial instruments [Line Items]    
Nominal Amount 306,961 291,065
Carrying amount of the hedging instrument, Asset 3,672 2,561
Carrying amount of the hedging instrument, Liability (30,154) (44,944)
Changes in fair value used for calculating hedge ineffectiveness 15,900 (19,316)
Cross-currency interest rate swaps | Cash flow hedges:    
Disclosure of financial instruments [Line Items]    
Nominal Amount 23,025 23,025
Carrying amount of the hedging instrument, Asset 879 0
Carrying amount of the hedging instrument, Liability 0 (1,254)
Changes in fair value used for calculating hedge ineffectiveness 2,132 (1,313)
Foreign exchange forward | Cash flow hedges:    
Disclosure of financial instruments [Line Items]    
Nominal Amount 225,388 352,553
Carrying amount of the hedging instrument, Asset 8,610 6,428
Carrying amount of the hedging instrument, Liability 0 (9,653)
Changes in fair value used for calculating hedge ineffectiveness 11,835 (5,093)
Foreign exchange forward | Net investment hedges:    
Disclosure of financial instruments [Line Items]    
Nominal Amount 9,243 3,780
Carrying amount of the hedging instrument, Asset 50 0
Carrying amount of the hedging instrument, Liability 0 (131)
Changes in fair value used for calculating hedge ineffectiveness $ 181 $ (415)