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Long-Term Investments (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 119 Months Ended |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  | 1 Months Ended
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Apr. 30, 2011 USD ($) | Apr. 30, 2011 CAD | Jun. 30, 2012 USD ($) | Jun. 30, 2011 USD ($) | Jun. 30, 2012 USD ($) | Jun. 30, 2011 USD ($) | Jun. 30, 2012 USD ($) | Dec. 31, 2011 USD ($) | Apr. 06, 2011 USD ($) | Apr. 06, 2011 CAD | Dec. 31, 2010 USD ($) | Jul. 31, 2002 USD ($) | Apr. 30, 2011 Midas Gold Corp [Member] USD ($) | Mar. 31, 2012 Midas Gold Corp [Member] USD ($) | Mar. 31, 2012 Midas Gold Corp [Member] CAD | Dec. 31, 2011 Midas Gold Corp [Member] USD ($) | Dec. 31, 2011 Midas Gold Corp [Member] CAD | Sep. 30, 2011 Midas Gold Corp [Member] USD ($) | Sep. 30, 2011 Midas Gold Corp [Member] CAD | Jun. 30, 2011 Midas Gold Corp [Member] USD ($) | Jun. 30, 2011 Midas Gold Corp [Member] CAD | Jun. 30, 2012 Midas Gold Corp [Member] USD ($) | Dec. 31, 2011 Midas Gold Corp [Member] | Apr. 06, 2011 Midas Gold Corp [Member] USD ($) | Jul. 31, 2011 Midas Gold Corp [Member] IPO [Member] | Apr. 30, 2011 Midas Gold Corp [Member] Private Placement [Member]
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction |  |  |  |  |  |  |  |  |  |  |  |  | 30,402,615 |  |  |  |  |  |  |  |  |  |  |  | 13,930,855 | 6,129,800
Purchase price per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.59 | 2.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement | $ 15,876,000 | 15,325.000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired (in shares) | 1,400,000 | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  | 3,632,000 | 3,500.000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of basic shares of subsidiary held (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 37.40% |  |  |  |  |  |  |  |  |  | 27.80% |  |  |
Percentage of diluted shares of subsidiary held (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 34.20% |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  | 72,207,144 |  | 72,207,144 |  | 72,207,144 | 71,503,883 |  |  |  |  |  | 114,466,936 | 114,466,936 |  |  |  |  |  |  |  |  | 31,802,615 |  |
Fair value of shares received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,535,000 |  | 78,872,000 |  |
Deferred income tax benefit/(expense) |  |  | 13,210,000 | (23,589,000) | 16,201,000 | (23,589,000) | (19,321,000) |  |  |  |  |  | 29,675,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,086,000 |  |
Unrealized loss on Midas Gold Shares |  |  | (34,951,000) | 0 | (42,316,000) | 0 | (4,969,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,316,000 |  |  |  |
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,724,000 |  |  |  |
Effective income tax rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.87% |  |  |  |
US Federal statutory income tax rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |
State effective income tax rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.87% |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 7,503,000 | 32,991,000 | 7,503,000 | 32,991,000 | 7,503,000 | 17,873,000 |  |  | 39,838,000 | 674,000 |  | 61,855,000 |  |  |  |  |  |  |  |  |  |  |  |
Trade and other receivables |  |  |  |  |  |  |  |  |  |  |  |  |  | 290,000 |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,000 |  |  |  |  |  |  |  |  |  |  |  |
Total current assets |  |  | 10,120,000 |  | 10,120,000 |  | 10,120,000 | 20,170,000 |  |  |  |  |  | 62,244,000 |  |  |  |  |  |  |  |  |  |  |  |
Non-current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buildings and equipment |  |  | 19,564,000 |  | 19,564,000 |  | 19,564,000 | 19,232,000 |  |  |  |  |  | 2,951,000 |  |  |  |  |  |  |  |  |  |  |  |
Exploration and evaluation assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,679,000 |  |  |  |  |  |  |  |  |  |  |  |
Reclamation bond |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000 |  |  |  |  |  |  |  |  |  |  |  |
Total non-current assets |  |  | 115,928,000 |  | 115,928,000 |  | 115,928,000 | 160,433,000 |  |  |  |  |  | 132,648,000 |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  | 126,048,000 |  | 126,048,000 |  | 126,048,000 | 180,603,000 |  |  |  |  |  | 194,892,000 |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade and other payables |  |  | 966,000 |  | 966,000 |  | 966,000 | 757,000 |  |  |  |  |  | 3,569,000 |  |  |  |  |  |  |  |  |  |  |  |
Current portion of notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  | 182,000 |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  | 2,033,000 |  | 2,033,000 |  | 2,033,000 | 2,466,000 |  |  |  |  |  | 18,000 |  |  |  |  |  |  |  |  |  |  |  |
Total current liabilities |  |  | 2,999,000 |  | 2,999,000 |  | 2,999,000 | 3,223,000 |  |  |  |  |  | 3,769,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-term portion of notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  | 561,000 |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  |  |  | 193,509,000 |  |  |  |  |  |  |  |  |  |  |  |
Equity reserve |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,787,000 |  |  |  |  |  |  |  |  |  |  |  |
Deficit |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,734,000) |  |  |  |  |  |  |  |  |  |  |  |
Total equity |  |  | 103,094,000 |  | 103,094,000 |  | 103,094,000 | 141,223,000 |  |  |  |  |  | 190,562,000 |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities and equity |  |  | 126,048,000 |  | 126,048,000 |  | 126,048,000 | 180,603,000 |  |  |  |  |  | 194,892,000 |  |  |  |  |  |  |  |  |  |  |  |
Operating expense |  |  | (8,953,000) | 71,259,000 | (15,950,000) | 67,123,000 | (29,969,000) |  |  |  |  |  |  | (2,927,000) |  | (3,949,000) |  | (2,988,000) |  | (3,349,000) |  |  |  |  |  |
Other income/(expense) |  |  |  |  |  |  |  |  |  |  |  |  |  | 482,000 |  | 1,645,000 |  | (3,768,000) |  | (52,000) |  |  |  |  |  |
Net income/(loss) |  |  | $ (30,504,000) | $ 47,764,000 | $ (41,728,000) | $ 43,887,000 | $ (66,382,000) |  |  |  |  |  |  | $ (2,445,000) |  | $ (2,304,000) |  | $ (6,756,000) |  | $ (3,401,000) |  |  |  |  |  |
Net loss per share, basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.02) |  | (0.02) |  | (0.07) |  | (0.04) |  |  |  |  |
Weighted average number of shares outstanding, basic and diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 107,008,000 | 107,008,000 | 105,248,000 | 105,248,000 | 102,557,000 | 102,557,000 | 86,903,000 | 86,903,000 |  |  |  |  |

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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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- Definition Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). + References No definition available. + Details
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