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Capital management (Tables)

12 Months Ended

Dec. 31, 2017

Capital Managment [Abstract]

Summary of Capital Structure

The capital structure at December 31 was as follows:
		2017		2016
Long-term debt [note 12]	$	1,494,471	$	1,493,327
Cash and cash equivalents		(591,620)		(320,278)
Net debt		902,851		1,173,049
Non-controlling interest		371		157
Shareholders' equity		4,859,288		5,258,371
Total equity		4,859,659		5,258,528
Total capital	$	5,762,510	$	6,431,577

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The disclosure of capital structure consisting of net debt and total equity.

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