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Financial instruments (Details 21) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Financial assets [1] $ 488,003 $ 403,035
91-120 days [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
91-120 days [member] | Corporations [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
91-120 days [member] | Banking and financial institutions [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
91-120 days [member] | Middle-market companies [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
121-150 days [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
121-150 days [member] | Corporations [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
121-150 days [member] | Banking and financial institutions [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
121-150 days [member] | Middle-market companies [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
151-180 days [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 4,000
151-180 days [member] | Corporations [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 4,000
151-180 days [member] | Banking and financial institutions [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
151-180 days [member] | Middle-market companies [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
Greater than 180 days [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 35,000 49,364
Greater than 180 days [member] | Corporations [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 14,364
Greater than 180 days [member] | Banking and financial institutions [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
Greater than 180 days [member] | Middle-market companies [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 35,000 35,000
Total past due [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 35,000 53,364
Total past due [member] | Corporations [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 18,364
Total past due [member] | Banking and financial institutions [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
Total past due [member] | Middle-market companies [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 35,000 35,000
Delinquent [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
Delinquent [member] | Corporations [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
Delinquent [member] | Banking and financial institutions [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
Delinquent [member] | Middle-market companies [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 0 0
Current [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 5,470,658 5,967,367
Current [member] | Corporations [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 2,606,113 3,424,446
Current [member] | Banking and financial institutions [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 2,657,444 2,283,876
Current [member] | Middle-market companies [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 207,101 259,045
Total [Member]    
Disclosure of financial instruments [Line Items]    
Financial assets 5,505,658 6,020,731
Total [Member] | Corporations [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 2,606,113 3,442,810
Total [Member] | Banking and financial institutions [member]    
Disclosure of financial instruments [Line Items]    
Financial assets 2,657,444 2,283,876
Total [Member] | Middle-market companies [member]    
Disclosure of financial instruments [Line Items]    
Financial assets $ 242,101 $ 294,045
[1] Current ratings as of December 31, 2017 and 2016, respectively.