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Financial instruments (Details 18) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Loans and receivables [1] $ 5,419,379 $ 5,907,494
Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 5,505,658 [2] 6,020,731
Floating interest rate [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 3,127,149 3,311,176
Fixed interest rate [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables $ 2,378,509 $ 2,709,555
[1] The carrying value of loans at amortized cost is net of the allowance for expected credit losses of $81.3 million and unearned interest and deferred fees of $5.0 million for December 31, 2017; allowance for expected credit losses of $106.0 million and unearned interest and deferred fees of $7.2 million for December 31, 2016.
[2] Current ratings as of December 31, 2017 and 2016, respectively.