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Investments
 12 Months Ended
Dec. 31, 2018
Investment in Marketable Securities [Abstract]  
INVESTMENTS
INVESTMENTS
Equity and Debt Securities
The Company makes strategic investments in equity and debt securities of silver and gold exploration and development companies.
 
At December 31, 2018
In thousands
Cost
 
Gross
Unrealized
Losses
 
Gross
Unrealized
Gains
 
Estimated
Fair Value
Equity Securities
 
 
 
 
 
 
 
Metalla Royalty & Streaming Ltd.
10,695

 
—

 
2,852

 
13,547

Rockhaven Resources, Ltd.
2,064

 
(452
)
 
—

 
1,612

Other
1,376

 
(946
)
 
—

 
430

Equity securities
$
14,135

 
$
(1,398
)
 
$
2,852

 
$
15,589

 
 
 
 
 
 
 
 
Debt Securities
 
 
 
 
 
 
 
Metalla Royalty & Streaming Ltd.
$
2,271

 
$
(54
)
 
$
—

 
$
2,217

 
 
 
 
 
 
 
 
Equity and debt securities
$
16,406

 
$
(1,452
)
 
$
2,852

 
$
17,806




 
At December 31, 2017
In thousands
Cost
 
Gross
Unrealized
Losses
 
Gross
Unrealized
Gains
 
Estimated
Fair Value
Equity Securities
 
 
 
 
 
 
 
Metalla Royalty & Streaming Ltd.
$
6,294

 
$
—

 
$
1,354

 
$
7,648

Corvus Gold Inc.
3,582

 
—

 
4,518

 
8,100

Almaden Minerals, Ltd.
3,125

 
(235
)
 
—

 
2,890

Northern Empire Resources Corp.(1)
4,489

 
—

 
1,077

 
5,566

Rockhaven Resources, Ltd.
2,064

 
(193
)
 
—

 
1,871

Kootenay Silver, Inc.
738

 
—

 
1

 
739

Other
1,479

 
(453
)
 
405

 
1,431

Equity securities
$
21,771

 
$
(881
)
 
$
7,355

 
$
28,245

 
 
 
 
 
 
 
 
Debt Securities
 
 
 
 
 
 
 
Metalla Royalty & Streaming Ltd.
$
6,677

 
$
(85
)
 
$
—

 
$
6,592

 
 
 
 
 
 
 
 
Equity and debt securities
$
28,448

 
$
(966
)
 
$
7,355

 
$
34,837


(1) In October 2018, the Company acquired the remaining outstanding shares of Northern Empire Resources Corp. not already owned by the Company.

The following table presents the disaggregated gain (loss) on equity securities recognized in Income (loss) from continuing operations on the Condensed Consolidated Statements of Comprehensive Income:
 
Year ended December 31,
In thousands
2018
 
2017
 
2016
Net gain (loss)
$
2,945

 
$
1,356

 
$
(2,691
)
Less: Realized (gain) loss
(7,964
)
 
(1,356
)
 
2,691

Unrealized gain (loss)
$
(5,019
)
 
$
—

 
$
—



The Company performs a quarterly assessment on its debt securities with unrealized losses to determine if the securities are other than temporarily impaired. The following table summarizes unrealized losses on debt securities for which other-than-temporary impairments have not been recognized and the fair values of those securities, aggregated by the length of time the individual securities have been in a continuous unrealized loss position, at December 31, 2018:

 
Less than twelve months
 
Twelve months or more
 
Total
In thousands
Unrealized Losses
Fair Value
 
Unrealized Losses
Fair Value
 
Unrealized Losses
Fair Value
Debt securities
—

—

 
53

2,217

 
53

2,217