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Other income (expense) (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income Expense [Abstract]  
Other income (expense) table
20172016
Foreign exchange losses$(23,168)$(5,935)
Contract settlements-59,027
Gain on change in investment accounting-7,032
Write-off of long-term receivables(5,926)-
Other(1,316)547
Total$(30,410)$60,671