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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

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