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Compensation Plans (Details) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Cash Bonus Plan [Member] | Jun. 30, 2013 Cash Bonus Plan [Member] | Jun. 30, 2014 Cash Bonus Plan [Member] | Jun. 30, 2013 Cash Bonus Plan [Member] | Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] | Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] | Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] | Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] | Jun. 30, 2014 Performance Shares [Member] | Jun. 30, 2013 Performance Shares [Member] | Jun. 30, 2014 Performance Shares [Member] | Jun. 30, 2013 Performance Shares [Member] | Jun. 30, 2014 Employee Stock Option [Member] | Jun. 30, 2014 Shares Issued to the Board of Directors [Member] | Jun. 30, 2013 Shares Issued to the Board of Directors [Member] | Jun. 30, 2014 Employee Stock [Member] | Jun. 30, 2013 Employee Stock [Member] | Jun. 30, 2014 Employee Stock [Member] | Jul. 23, 2014 Subsequent Event [Member] Restricted Stock Units (RSUs) [Member] | Jul. 23, 2014 Subsequent Event [Member] Performance Shares [Member]
Compensation plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  | 15.00% |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,249 | 44,437 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000.00 |  | $ 25,000.00 |  |
ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentOfOfferingDatePricePaid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  | 1,200,000 |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,009 | 28,169 |  |  |  |  |
Multiplier Applied to PSU Awards at Settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.55
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 231,256 | 202,404
Cash Paid in Current Period for Bonus Compensation |  |  |  |  | 41,700,000 | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued Cash Bonus Plan Expense |  |  | 6,200,000 | 5,300,000 | 12,800,000 | 10,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RSUs, PSUs, and Director's Shares [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Shares to be Received Upon Settlement |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 14,341,000 | 18,068,000 |  |  |  |  | 2,900,000 | 3,300,000 | 5,700,000 | 6,300,000 | 3,600,000 | 5,000,000 | 6,800,000 | 9,700,000 |  | 1,197,000 | 1,354,000 |  |  |  |  |
Unrecognized stock based compensation expense |  |  |  |  |  |  | 12,800,000 |  | 12,800,000 |  | 11,300,000 |  | 11,300,000 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Low End of Range |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Common stock awards vesting multiplier, high end of range |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Share-based Compensation, Awards Other Than Options, Performance Measurement Period |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Stock option activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options outstanding at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,088 |  |  |  |  |  |  |
Stock options outstanding at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,088 |  |  |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.87 |  |  |  |  |  |  |
Stock options outstanding at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.87 |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested at the end of the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,472,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 243,389 |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period, Net of Shares Withheld for Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 164,490 | 85,121
Shares Paid for Tax Withholding for Share Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78,899 | 45,042

X
- Definition Accrued cash bonus plan expense related to the specific performance for a period which has been included within the general and administrative expense and exploration line items in the statement of operations. + References No definition available. + Details
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- Definition Represents the amount of cash paid for bonuses during the period based on previous performance. + References No definition available. + Details
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- Definition Multiplier Applied to PSU Awards at Settlement + References No definition available. + Details
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- Definition Represents the number of entity's common shares to be received upon settlement. + References No definition available. + Details
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- Definition High end of the range of portion of shares earned at end of measurement period + References No definition available. + Details
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- Definition Low end of the range of portion of shares earned at end of measurement period + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription + References No definition available. + Details
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- Definition Percentage of offering date price paid by ESPP participant + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period, Net of Shares Withheld for Tax + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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