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Finance costs (Tables)

12 Months Ended

Dec. 31, 2017

Finance Costs [Abstract]

Schedule of finance costs

		2017			2016
Interest on long-term debt	$	73,211		$	73,434
Unwinding of discount on provisions [note 14]		22,020			20,733
Other charges		15,377			16,860
Interest on short-term debt		-			879
Total	$	110,608		$	111,906

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