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Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 17, 2015 | Feb. 20, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |
Revenue |  |  | $ 162,552 | $ 170,938 | $ 481,770 | $ 495,133 |
Common stock issued for the acquisition of Paramount Gold and Silver Corp. |  |  |  |  | 32,667,327 |  |
Stock Issued During Period, Value, Acquisitions (in dollars per share) |  |  |  |  | $ 5.78 |  |
Assets acquired: |  |  |  |  |  |  |
Receivables |  |  | 121,106 |  | $ 121,106 |  | $ 138,607
Ore on leach pads |  |  | 68,695 |  | 68,695 |  | 48,204
Property, Plant and Equipment, Net |  |  | 261,043 |  | 261,043 |  | 227,911
Mining properties, net |  |  | 851,590 |  | 851,590 |  | $ 501,192
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |
Net income (loss) |  |  | (14,219) | 3,466 | (64,185) | (76,846) |
Paramount Gold and Silver Corp. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common shares issued | $ 188,817 |  |  |  |  |  |
Cash | 8,530 |  |  |  |  |  |
Transaction advisory fees and other acquisition costs | 4,020 |  |  |  |  |  |
Total purchase price | 201,367 |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Cash and cash equivalents | 118 |  |  |  |  |  |
Other current assets | 1,685 |  |  |  |  |  |
Property, plant, and equipment, net | 215 |  |  |  |  |  |
Mining properties, net | 305,175 |  |  |  |  |  |
Assets | 307,193 |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |
Accounts payable and accrued liabilities | 2,737 |  |  |  |  |  |
Deferred income taxes | 103,089 |  |  |  |  |  |
Liabilities | 105,826 |  |  |  |  |  |
Net assets acquired | $ 201,367 |  |  |  |  |  |
Wharf Gold Mine [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  | $ 99,800 |  |  |  |  |
Transaction advisory fees and other acquisition costs |  |  | 2,100 |  | 2,100 |  |
Assets acquired: |  |  |  |  |  |  |
Other current assets |  | 2,924 |  |  |  |  |
Cash |  | 982 |  |  |  |  |
Receivables |  | 3,061 |  |  |  |  |
Inventory |  | 2,147 |  |  |  |  |
Ore on leach pads |  | 12,710 |  |  |  |  |
Property, Plant and Equipment, Net |  | 30,055 |  |  |  |  |
Mining properties, net |  | 81,189 |  |  |  |  |
Other non-current assets |  | 3,966 |  |  |  |  |
Assets |  | 137,034 |  |  |  |  |
Liabilities: |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  | 5,494 |  |  |  |  |
Deferred income taxes |  | 9,680 |  |  |  |  |
Reclamation |  | 18,270 |  |  |  |  |
Other non-current liabilities |  | 3,750 |  |  |  |  |
Liabilities |  | 37,194 |  |  |  |  |
Net assets acquired |  | $ 99,840 |  |  |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |
Revenue |  |  |  | 190,323 | 499,770 | 555,344 |
Income (loss) before income and mining taxes |  |  | (22,479) | (9,125) | (72,688) | (79,190) |
Net income (loss) |  |  | $ (14,219) |  |  |  |
Net income (loss) |  |  |  | $ 7,383 | $ (64,237) | $ (60,554) |

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