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Investments
 6 Months Ended
Jun. 30, 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 June 30, 2018
In thousands
Cost
 
Gross
Unrealized
Losses
 
Gross
Unrealized
Gains
 
Estimated
Fair Value
Equity Securities
 
 
 
 
 
 
 
Metalla Royalty & Streaming Ltd.
6,294

 
—

 
2,228

 
8,522

Northern Empire Resources Corp.
4,489

 
—

 
2,298

 
6,787

Rockhaven Resources, Ltd.
2,064

 
(623
)
 
—

 
1,441

Other
1,441

 
(634
)
 
20

 
827

Equity securities
$
14,288

 
$
(1,257
)
 
$
4,546

 
$
17,577

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

 
$
(450
)
 
$
—

 
$
6,227

 
 
 
 
 
 
 
 
Equity and debt securities
$
20,965

 
$
(1,707
)
 
$
4,546

 
$
23,804



 
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



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 June 30,
 
Six months ended June 30,
In thousands
2018
 
2017
 
2018
 
2017
Net gain (loss)
$
(2,493
)
 
$
203

 
$
2,017

 
$
(1,268
)
Less: Realized (gain) loss
(5,535
)
 
(203
)
 
(5,202
)
 
1,268

Unrealized gain (loss)
$
(8,028
)
 
$
—

 
$
(3,185
)
 
$
—



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 June 30, 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


Restricted Assets
The Company, under the terms of its self-insurance and bonding agreements with certain banks, lending institutions and regulatory agencies, is required to collateralize certain portions of its asset retirement obligations. The Company has collateralized these obligations by assigning certificates of deposit that have maturity dates ranging from three months to a year to the applicable institutions or agencies. At June 30, 2018 and December 31, 2017, the Company held certificates of deposit and cash equivalents under these agreements of $21.6 million and $20.8 million, respectively. The ultimate timing of the release of the collateralized amounts is dependent on the timing and closure of each mine and repayment of the obligation. In order to release the collateral, the Company must seek approval from certain government agencies responsible for monitoring the mine closure status. Collateral could also be released to the extent the Company is able to secure alternative financial assurance satisfactory to the regulatory agencies. The Company believes the collateral will remain in place beyond a twelve-month period and has therefore classified these investments as long-term.