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Investments (Tables)
 6 Months Ended
Jun. 30, 2020
Investment in Marketable Securities [Abstract]  
Investments The Company makes strategic investments in equity and debt securities of silver and gold exploration, development and royalty and streaming companies.
At June 30, 2020
In thousandsCostGross
Unrealized
Losses		Gross
Unrealized
Gains		Estimated
Fair Value
Equity Securities
Metalla Royalty & Streaming Ltd.$1,852  $—  $2,964  $4,816  
Integra Resources Corp.5,000  —  3,023  8,023  
Rockhaven Resources Ltd.2,064  (398) —  1,666  
Other448  —  133  581  
Equity securities$9,364  $(398) $6,120  $15,086  
At December 31, 2019
In thousandsCostGross
Unrealized
Losses		Gross
Unrealized
Gains		Estimated
Fair Value
Equity Securities
Metalla Royalty & Streaming Ltd.$10,463  $—  $17,725  $28,188  
Integra Resources Corp.5,000  —  355  5,355  
Rockhaven Resources, Ltd.2,064  (376) —  1,688  
Other1,304  (889) —  415  
Equity securities$18,831  $(1,265) $18,080  $35,646