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Financial Risk Management - Changes in Level 3 Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
At the beginning of the year $ 14,003,275  
At the end of the year 14,398,218 $ 14,003,275
Level 3 of fair value hierarchy [member]    
Statement Line Items [Line Items]    
At the beginning of the year 23,242 23,234
Acquisition 3,681
Decrease due to write down (564)
Currency translation adjustment and others 50 8
At the end of the year $ 26,409 $ 23,242