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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
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
 
2018

 
2017

Adjustments for non-cash income statement items:
 
 
 
 
 
Share-based compensation expense
 
$
2,957

 
$
3,077

 
Loss on securities held
 
3,298

 
—

 
Gains on commodity and foreign currency contracts (Note 8)
 
(4,930
)
 
(606
)
 
Loss (gain) on derivatives (Note 8)
 
1,078

 
(64
)
 
Loss on inventory
 
4,670

 
—

 
Share of income from associate and dilution gain (Note 13)
 
(13,679
)
 
(2,052
)
 
NRV adjustment for inventories
 
24,330

 
12,308

 
 
 
$
17,724

 
$
12,663
Changes in non-cash working capital
Changes in non-cash operating working capital items:
 
2018

 
2017

Trade and other receivables
 
$
6,256

 
$
9,852

Inventories
 
(12,128
)
 
10,898

Prepaid expenses
 
1,878

 
(3,096
)
Accounts payable and accrued liabilities
 
8,053

 
2,569

Provisions
 
(8,320
)
 
(8,514
)
 
 
$
(4,261
)
 
$
11,709
Schedule of significant non-cash items
Significant non-cash items:
 
2018

 
2017

Assets acquired by finance lease
 
$
7,028

 
$
5,000

Share-based compensation issued to employees and directors
 
$
1,879

 
$
2,020

Shares issued as consideration for select Argentine projects (Note 11)
 
$
—

 
$
8,650
Cash and cash equivalents
Cash and Cash Equivalents
 
December 31,
2018

 
December 31,
2017

Cash in banks
 
$
77,735

 
$
160,001

Short-term money market investments
 
60,775

 
15,952

Cash and cash equivalents
 
$
138,510

 
$
175,953