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Acquisitions - Northern Empire (Details) - Northern Empire Resources Corp. shares in Thousands | 1 Months Ended |
--- | --- | ---
Oct. 31, 2018 USD ($) shares | Oct. 31, 2017 USD ($) shares | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Common shares issued (value) | $ 63,887,000 |  |
Fair value of existing investment in Northern Empire | 7,257,000 |  |
Transaction advisory fees and other acquisition costs |  |  | $ 2,449,000
Purchase price | $ 73,593,000 |  |
Assets: |  |  |
Cash |  |  | 5,309,000
Receivables and other assets |  |  | 465,000
Restricted assets |  |  | 4,300,000
Property, plant, and equipment |  |  | 1,351,000
Mining properties, net |  |  | 99,515,000
Deferred income taxes |  |  | 587,000
Total assets acquired |  |  | 111,527,000
Liabilities: |  |  |
Accounts payable and accrued liabilities |  |  | 10,895,000
Reclamation liabilities |  |  | 2,659,000
Deferred income taxes |  |  | 24,380,000
Total liabilities assumed |  |  | 37,934,000
Net assets acquired |  |  | $ 73,593,000
Common Stock |  |  |
Business Acquisition [Line Items] |  |  |
Common stock conversion ratio | 0.1850 |  |
Common shares issued (in shares) | shares | 12,100 | 12,122,683 |
Price per common share issued (UDS per share) |  | $ 5,270 |

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