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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Financial instruments [Abstract]  
Disclosure of financial instruments at fair value through profit or loss
The Company’s financial assets and liabilities classified as at FVTPL are as follows: 
 
 
December 31,
2017

 
December 31,
2016

Current derivative assets:
 
 

 
 

Warrants
 
$
1,092

 
$
—

 
 
$
1,092

 
$
—

 
 
December 31,
2017

 
December 31,
2016

Current derivative liabilities:
 
 

 
 

Zinc contracts
 
$
716

 
$
1,769

Lead Contracts
 
243

 
54

Copper contracts
 
891

 
—

Foreign currency contracts
 
56

 
992

 
 
$
1,906

 
$
2,815

 
In addition, trade and other receivables include accounts receivable arising from sales of metal concentrates and have been designated and classified as at FVTPL. The total trade and other receivables are as follows: 
 
 
December 31,
2017

 
December 31,
2016

Trade receivables from provisional concentrates sales
 
$
51,952

 
$
44,960

Advances to suppliers(1)
 
14,327

 
28,762

Not arising from sale of metal concentrates(2)
 
43,467

 
56,395

Trade and other receivables
 
$
109,746

 
$
130,117

(1)
Advances to suppliers are not classified as financial instruments.
(2)
Accounted for at amortized cost.
The net gains (losses) on derivatives for the year ended December 31, 2017 and 2016 were comprised of the following:
 
 
Year ended
December 31,
 
 
2017

 
2016

Gains (losses) on commodity and diesel fuel swap and foreign currency contracts:
 
 

 
 
Realized losses on foreign currency, diesel fuel swap and commodity contracts
 
$
(304
)
 
$
(4,965
)
Unrealized gains on foreign currency, diesel fuel swap and commodity contracts
 
910

 
21

 
 
$
606

 
$
(4,944
)
Gain on derivatives:
 
 

 
 
Gain on warrants
 
$
64

 
$
—

 
 
$
64


$
—
Disclosure of available-for-sale financial assets
The unrealized net gains on available-for-sale investments recognized in other comprehensive income for the year ended December 31, were as follows: 
 
 
Year ended
December 31,
 
 
2017

 
2016

Unrealized net gains on available for sale securities
 
$
810

 
$
912

Reclassification adjustment for realized losses (gains) on equity securities to earnings
 
361

 
(20
)
 
 
$
1,171

 
$
892
Disclosure of credit risk exposure
Cash and cash equivalents, trade accounts receivable and other receivables that represent the maximum credit risk to the Company consist of the following: 
 
 
December 31,
2017

 
December 31,
2016

Cash and cash equivalents
 
$
175,953

 
$
180,881

Short-term investments
 
51,590

 
36,729

Trade accounts receivable(1)
 
51,952

 
44,960

Royalty receivable(1)
 
60

 
20

Employee loans(1)
 
491

 
1,048

(1)
Included in Trade and other receivables.
Disclosure of exposure to currency risk through financial assets and liabilities
The Company is exposed to currency risk through the following financial assets and liabilities, and deferred income tax assets and liabilities denominated in foreign currencies:  
At December 31, 2017
 
Cash and
short-term
investments
 
Other current and
non-current
assets
 
Income taxes
receivable
(payable),
current and non-
current
 
Accounts payable
and accrued
liabilities and non-
current liabilities
 
Deferred tax
assets and  
liabilities
Canadian Dollar
 
$
25,062

 
$
529

 
$
(713
)
 
$
(348
)
 
$
—

Mexican Peso
 
5,188

 
22,809

 
(242
)
 
(26,013
)
 
(141,870
)
Argentinian Peso
 
4,239

 
19,720

 
837

 
(28,685
)
 
—

Bolivian Boliviano
 
4,659

 
495

 
(3,840
)
 
(13,954
)
 
(10,076
)
European Euro
 
24

 
—

 
(780
)
 
—

 
—

Peruvian Nuevo Sol
 
2,274

 
1,026

 
(4,402
)
 
(13,478
)
 
(16,603
)
 
 
$
41,446

 
$
44,579

 
$
(9,140
)

$
(82,478
)

$
(168,549
)
  
At December 31, 2016
 
Cash and
short-term
investments
 
Other current and
non-current
assets
 
Income taxes
receivable
(payable),
current and non-
current
 
Accounts payable
and accrued
liabilities and non-
current liabilities
 
Deferred tax
assets and
liabilities
Canadian Dollar
 
$
6,513

 
$
338

 
$
(45
)
 
$
(142
)
 
$
(356
)
Mexican Peso
 
9,416

 
29,079

 
5,884

 
(45,388
)
 
(150,394
)
Argentinian Peso
 
3,485

 
24,062

 
367

 
(27,245
)
 
—

Bolivian Boliviano
 
4,329

 
184

 
(3,365
)
 
(13,476
)
 
(8,464
)
European Euro
 
37

 
—

 
(262
)
 
—

 
(53
)
Peruvian Nuevo Sol
 
817

 
2,158

 
(11,031
)
 
(8,913
)
 
(9,867
)
 
 
$
24,597

 
$
55,821

 
$
(8,452
)
 
$
(95,164
)
 
$
(169,134
)
Disclosure of maturity analysis for derivative financial liabilities
The following table summarizes the remaining contractual maturities of the Company's financial and non-financial liabilities, shown in contractual undiscounted cash flow:
Payments due by period 2017
 
 
Total
 
Within 1 year(1)
 
2 - 3 years
 
4- 5 years
 
After 5
years
Current liabilities
 
$
136,506

 
$
136,506

 
$
—

 
$
—

 
$
—

Credit Facility
 
2,750

 
1,200

 
1,550

 
—

 
—

Loan obligation
 
3,000

 
3,000

 
—

 
—

 
—

Finance lease obligations(2)
 
7,724

 
5,879

 
1,845

 
—

 
—

Severance accrual
 
5,176

 
1,092

 
2,273

 
760

 
1,051

Employee compensation(3)
 
6,709

 
3,815

 
2,894

 
—

 
—

Loss on commodity contracts
 
1,906

 
1,906

 
—

 
—

 
—

Provisions(4)
 
4,097

 
2,681

 
546

 
627

 
243

Income taxes payable
 
26,131

 
26,131

 
—

 
—

 
—

Total contractual obligations(4)
 
$
193,999

 
$
182,210

 
$
9,108

 
$
1,387

 
$
1,294

Payments due by period 2016
 
 
Total
 
Within 1 year(1)
 
2 - 3 years
 
4- 5 years
 
After 5
years
Current liabilities
 
$
141,002

 
$
141,002

 
$
—

 
$
—

 
$
—

Credit Facility
 
38,440

 
960

 
1,280

 
36,200

 
—

Finance lease obligations(2)
 
7,321

 
3,720

 
3,601

 
—

 
—

Severance accrual
 
3,986

 
689

 
658

 
365

 
2,274

Employee compensation(3)
 
6,918

 
3,996

 
2,922

 
—

 
—

Loss on commodity contracts
 
2,815

 
2,815

 
—

 
—

 
—

Provisions(4)
 
4,719

 
3,262

 
562

 
629

 
266

Income taxes payable
 
25,911

 
25,911

 
—

 
—

 
—

Total contractual obligations(4)
 
$
231,112

 
$
182,355

 
$
9,023

 
$
37,194

 
$
2,540

(1)
Includes all current liabilities in the consolidated statement of financial position at December 31, 2017 and December 31, 2016 plus items presented separately in this table that are expected to be paid but not accrued in the books of the Company. A reconciliation of the current liabilities balance in the statement of financial position to the total contractual obligations within one year, per the contractual maturities schedule is shown in the table below.
December 31, 2017
 
 
 
Future interest component
 
Within 1 year
Current portion of:
 
 

 
 

 
 

Accounts payable and other liabilities
 
$
136,506

 
$
—

 
$
136,506

Credit facility
 
—

 
1,200

 
1,200

Loan obligation
 
3,000

 
—

 
3,000

Current portion of finance lease
 
5,734

 
145

 
5,879

Current severance liability
 
1,092

 
—

 
1,092

Employee Compensation & RSU’s
 
2,100

 
1,715

 
3,815

Unrealized loss on commodity contracts
 
1,906

 
—

 
1,906

Provisions(4)
 
2,681

 
—

 
2,681

Income tax payable
 
26,131

 
—

 
26,131

Total contractual obligations within one year(4)
 
$
179,150

 
$
3,060

 
$
182,210

December 31, 2016
 
 
 
Future interest component
 
Within 1 year
Current portion of:
 
 
 
 
 
 
Accounts payable and other liabilities
 
$
141,002

 
$
—

 
$
141,002

Credit facility
 
—

 
960

 
960

Current portion of finance lease
 
3,559

 
161

 
3,720

Current severance liability
 
689

 
—

 
689

Employee Compensation & RSU’s
 
1,812

 
2,184

 
3,996

Unrealized loss on commodity contracts
 
2,815

 
—

 
2,815

Provisions(4)
 
3,262

 
—

 
3,262

Income tax payable
 
25,911

 
—

 
25,911

Total contractual obligations within one year(4)
 
$
179,050

 
$
3,305

 
$
182,355

(2)
Includes lease obligations in the amount of $7.7 million (2016 - $7.3 million) with a net present value of $7.6 million (2016 - $7.1 million) discussed further in Note 17.
(3)
Includes RSU obligation in the amount of $4.1 million (2016 - $4.8 million) that will be settled in cash. The RSUs vest in two instalments, 50% in December 2017 and 50% in December 2018.
(4)
Amounts above do not include payments related to the Company’s anticipated closure and decommissioning obligation (current $5.6 million, long-term $59.8 million) discussed in Note 16 (2016 - current $5.2 million, long-term $50.4 million), the deferred credit arising from the Aquiline acquisition ($20.8 million) (2016 - $20.8 million) discussed in Note 19, and deferred tax liabilities of $171.2 million (2016 - $170.9 million).
Disclosure of assets and liabilities in the fair value hierarchy
At December 31, 2017 and 2016, the levels in the fair value hierarchy into which the Company’s financial assets and liabilities are measured and recognized on the Consolidated Statements of Financial Position at fair value are categorized as follows: 
 
 
Fair Value at December 31, 2017
 
 
Total
 
Level 1
 
Level 2
 
Level 3
Assets and Liabilities:
 
 

 
 

 
 

 
 

Short-term investments
 
$
51,590

 
$
51,590

 
$
—

 
$
—

Trade receivables from provisional concentrate sales
 
51,952

 
—

 
51,952

 
—

Warrants
 
1,092

 
—

 
1,092

 
—

Zinc contracts
 
(716
)
 
—

 
(716
)
 
—

Lead contracts
 
(243
)
 
—

 
(243
)
 
—

Copper contracts
 
(891
)
 
—

 
(891
)
 
—

Foreign currency contracts
 
(56
)
 
—

 
(56
)
 
—

 
 
$
102,728

 
$
51,590

 
$
51,138

 
$
—

 
 
Fair Value at December 31, 2016
 
 
Total
 
Level 1
 
Level 2
 
Level 3
Assets and Liabilities:
 
 

 
 

 
 

 
 

Short-term investments
 
$
36,729

 
$
36,729

 
$
—

 
$
—

Trade receivables from provisional concentrate sales
 
44,960

 
—

 
44,960

 
—

Zinc contracts
 
(1,769
)
 
—

 
(1,769
)
 
—

Lead contracts
 
(54
)
 
 
 
(54
)
 
 
Foreign currency contracts
 
(992
)
 
—

 
(992
)
 
—

 
 
$
78,874

 
$
36,729

 
$
42,145

 
$
—