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Investments (Tables)
 3 Months Ended
Mar. 31, 2018
Investment in Marketable Securities [Abstract]  
Investments
 
At March 31, 2018
In thousands
Cost
 
Gross
Unrealized
Losses
 
Gross
Unrealized
Gains
 
Estimated
Fair Value
Equity Securities
 
 
 
 
 
 
 
Metalla Royalty & Streaming Ltd.
$
6,294

 
$
—

 
$
2,837

 
$
9,131

Corvus Gold Inc.
3,582

 
—

 
6,844

 
10,426

Almaden Minerals, Ltd.
2,067

 
(727
)
 
—

 
1,340

Northern Empire Resources Corp.
4,489

 
—

 
2,999

 
7,488

Rockhaven Resources, Ltd.
2,064

 
(596
)
 
—

 
1,468

Other
1,190

 
(155
)
 
115

 
1,150

Equity securities
$
19,686

 
$
(1,478
)
 
$
12,795

 
$
31,003

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

 
$
(363
)
 
$
—

 
$
6,314

 
 
 
 
 
 
 
 
Equity and debt securities
$
26,363

 
$
(1,841
)
 
$
12,795

 
$
37,317



 
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.
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
Unrealized Gain (Loss) on Investments [Table Text Block]
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:
 
Three months ended March 31,
In thousands
2018
 
2017
Net gain (loss)
$
4,529

 
$
(1,471
)
Less: Realized (gain) loss
313

 
1,471

Unrealized gain (loss)
$
4,842

 
$
—
Schedule of Unrealized Loss on Investments [Table Text Block]
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 March 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
363

6,314

 
—

—

 
363

6,314