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Acquisitions - Northern Empire (Details) - Northern Empire Resources Corp. | 1 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2018 USD ($) shares | Dec. 31, 2019 USD ($) | 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: |  |  |
Total assets acquired |  | $ 111,527,000 |
Liabilities: |  |  |
Total liabilities assumed |  | 37,934,000 |
Total assets acquired |  | $ 73,593,000 |
Common Stock |  |  |
Business Acquisition [Line Items] |  |  |
Common stock conversion ratio | 0.1850 |  |
Common shares issued (in shares) | shares | 12,100,000 |  |
Price per common share issued (UDS per share) |  |  | $ 5,270

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