Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure of cash flow statement [Abstract]

Changes in other operating activities

The following tables summarize other adjustments for non-cash income statement items, changes in operating working capital items and significant non-cash items: 

Other operating activities		2019			2018
Adjustments for non-cash income statement items:
	Share-based compensation expense	$	4,448		$	2,957
	(Gain) loss on securities held	(83,705		)	3,298
	Gains on commodity and foreign currency contracts (Note 9)	(3,315		)	(4,930		)
	Loss on derivatives (Note 9)	14			1,078
	Loss on inventory	—			4,670
	Share of income from associate and dilution gain (Note 14)	(15,245		)	(13,679		)
	Net realizable value adjustment for inventories (Note 22)	(356		)	24,330
	Project development write-down	1,882			—
		$	(96,277	)	$	17,724

Changes in non-cash working capital

Changes in non-cash operating working capital items:	2019			2018
Trade and other receivables	$	1,545		$	6,256
Inventories	22,753			(12,128		)
Prepaid expenses	(4,093		)	1,878
Accounts payable and accrued liabilities	(43,527		)	8,053
Provisions	(4,622		)	(8,320		)
	$	(27,944	)	$	(4,261	)

Schedule of significant non-cash items

Significant non-cash items:	2019		2018
Assets acquired by finance lease	$	51,181	$	7,028
Share-based compensation issued to employees and directors	$	2,693	$	1,879

Cash and cash equivalents

Cash and Cash Equivalents	December 31, 2019		December 31, 2018
Cash in banks	$	120,564	$	77,735
Short-term money market investments	—		60,775
Cash and cash equivalents	$	120,564	$	138,510