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Investments (Tables)
 3 Months Ended
Mar. 31, 2019
Investment in Marketable Securities [Abstract]  
Investments
 
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
Unrealized Gain (Loss) on Investments [Table Text Block]
Schedule of Unrealized Loss on Investments [Table Text Block]
t March 31, 2019, there were no debt securities with unrealized losses.