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Investments
 3 Months Ended
Mar. 31, 2019
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 March 31, 2019
In thousands
Cost
 
Gross
Unrealized
Losses
 
Gross
Unrealized
Gains
 
Estimated
Fair Value
Equity Securities
 
 
 
 
 
 
 
Metalla Royalty & Streaming Ltd.
$
11,803

 
$
—

 
$
12,055

 
$
23,858

Rockhaven Resources, Ltd.
2,064

 
(475
)
 
—

 
1,589

Other
1,356

 
(928
)
 
—

 
428

Equity securities
$
15,223

 
$
(1,403
)
 
$
12,055

 
$
25,875




 
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


(1)     In October 2018, the Company acquired the remaining outstanding shares of Northern Empire Resources Corp. not already owned by the Company.
    
The Company performs a quarterly assessment on its debt securities with unrealized losses to determine if the securities are other than temporarily impaired. At March 31, 2019, there were no debt securities with unrealized losses.