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Financial Instruments (Details 23) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Fair value of financial instruments [Line Items]    
Beginning Balance [1] $ 403,035  
Ending Balance [1] 488,003 $ 403,035
Loans and receivables, category [member]    
Disclosure of Fair value of financial instruments [Line Items]    
Beginning Balance 6,020,731 6,691,749
Transfer in book value to stage 2 0 0
Transfer to lifetime expected credit losses - credit-impaired 0 0
Transfer in book value to stage 1 0 0
Financial assets that have been derecognized during the year (4,549,758) (4,716,536)
Changes due to financial instruments recognized (4,549,758) (4,716,536)
New financial assets originated or purchased 4,067,723 4,064,325
Write-offs (33,038) (18,807)
Ending Balance 5,505,658 6,020,731
Loans and receivables, category [member] | 12-month expected credit losses [member]    
Disclosure of Fair value of financial instruments [Line Items]    
Beginning Balance 5,019,368 6,282,752
Transfer in book value to stage 2 (41,167) (828,589)
Transfer to lifetime expected credit losses - credit-impaired 0 (12,000)
Transfer in book value to stage 1 8,000 90,770
Financial assets that have been derecognized during the year (4,214,697) (4,577,890)
Changes due to financial instruments recognized (4,247,864) (5,327,709)
New financial assets originated or purchased 4,067,723 4,064,325
Write-offs 0 0
Ending Balance 4,839,227 5,019,368
Loans and receivables, category [member] | Lifetime expected credit losses [member]    
Disclosure of Fair value of financial instruments [Line Items]    
Beginning Balance 935,999 356,668
Transfer in book value to stage 2 41,167 828,589
Transfer to lifetime expected credit losses - credit-impaired (46,673) (45,056)
Transfer in book value to stage 1 (8,000) (90,770)
Financial assets that have been derecognized during the year (313,394) (113,432)
Changes due to financial instruments recognized (326,900) 579,331
New financial assets originated or purchased 0 0
Write-offs (1,427) 0
Ending Balance 607,672 935,999
Loans and receivables, category [member] | Credit impairment of financial instruments [member]    
Disclosure of Fair value of financial instruments [Line Items]    
Beginning Balance 65,364 52,329
Transfer in book value to stage 2 0 0
Transfer to lifetime expected credit losses - credit-impaired 46,673 57,056
Transfer in book value to stage 1 0 0
Financial assets that have been derecognized during the year (21,667) (25,214)
Changes due to financial instruments recognized 25,006 31,842
New financial assets originated or purchased 0 0
Write-offs (31,611) (18,807)
Ending Balance $ 58,759 $ 65,364
[1] Current ratings as of December 31, 2017 and 2016, respectively.