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Acquisitions Paramount (Details) - Paramount Gold and Silver Corp. [Member] $ in Thousands | Apr. 17, 2015 USD ($)
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Business Acquisition [Line Items] |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 188,817
Business Combination, Consideration Transferred, Purchase Price | 201,367
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 307,193
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Conversion Ratio | 0.2016
Payments to Acquire Businesses, Gross | $ 8,530
Business Acquisition, Transaction Costs | 4,020
Business Combination, Separately Recognized Transactions, Payments to Acquire Additional Interests | $ 1,500
Noncontrolling Interest, Ownership Percentage by Parent | 4.90%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 105,826
Business Combination, Consideration Transferred | $ 201,367

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