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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Available-for-sale Securities [Abstract]          
Gain (Loss) on Investments $ 283 $ (32) $ 2,301 $ (1,300)  
Marketable Securities, Realized Gain (Loss) 3 32 (5,199) 1,300  
Unrealized gain (loss) on equity securities 286 $ 0 (2,898) $ 0  
Investment in Marketable Securities (Textual) [Abstract]          
Held-to-maturity Securities, Restricted 21,400   21,400   $ 20,800
Equity securities          
Available-for-sale Securities          
Cost 16,090   16,090   21,771
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (1,254)   (1,254)   (881)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 4,829   4,829   7,355
Available-for-sale Securities 19,665   19,665   28,245
Debt Securities          
Available-for-sale Securities          
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (257)   (257)    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0   0    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0   0    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 257   257    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 4,568   4,568    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,568   4,568    
Equity and debt securities          
Available-for-sale Securities          
Cost 20,915   20,915   28,448
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (1,512)   (1,512)   (966)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 4,829   4,829   7,355
Available-for-sale Securities 24,232   24,232   34,837
Metalla Royalty & Streaming Ltd. | Equity securities          
Available-for-sale Securities          
Cost 8,147   8,147   6,294
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0   0   0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 2,113   2,113   1,354
Available-for-sale Securities 10,260   10,260   7,648
Metalla Royalty & Streaming Ltd. | Debt Securities          
Available-for-sale Securities          
Cost 4,825   4,825   6,677
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (258)   (258)   (85)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 0   0   0
Available-for-sale Securities         6,592
Corvus Gold Inc. [Member] | Equity securities          
Available-for-sale Securities          
Cost         3,582
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax         0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax         4,518
Available-for-sale Securities         8,100
Almaden Minerals, Ltd. [Member] | Equity securities          
Available-for-sale Securities          
Cost         3,125
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax         (235)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax         0
Available-for-sale Securities         2,890
Northern Empire Resources Corp. | Equity securities          
Available-for-sale Securities          
Cost 4,489 [1]   4,489 [1]   4,489
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0 [1]   0 [1]   0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 2,716 [1]   2,716 [1]   1,077
Available-for-sale Securities 7,205 [1]   7,205 [1]   5,566
Rockhaven Resources, Ltd. [Member] | Equity securities          
Available-for-sale Securities          
Cost 2,064   2,064   2,064
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (538)   (538)   (193)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 0   0   0
Available-for-sale Securities 1,526   1,526   1,871
Other Investments [Member] | Equity securities          
Available-for-sale Securities          
Cost 1,390   1,390   1,479
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (716)   (716)   (453)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 0   0   405
Available-for-sale Securities 674   674   1,431
Kootenay Silver, Inc. [Member] | Equity securities          
Available-for-sale Securities          
Cost         738
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax         0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax         1
Available-for-sale Securities         739
Level 3 | Equity and debt securities          
Available-for-sale Securities          
Available-for-sale Securities         $ 6,891
Available-for-sale Securities | Level 3 | Equity and debt securities          
Available-for-sale Securities          
Available-for-sale Securities $ 4,567   $ 4,567    
[1] (1) In October 2018, the Company acquired the remaining outstanding shares of Norther Empire Resources Corp. not already owned by the Company. See Note 23 -- Subsequent Events for additional detail.