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Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | Stock Option Grants Under the Equity Incentive Compensation Plan A summary of activity associated with the Company’s Stock Option Plan for the nine months ended September 30, 2014, is presented in the following table:
| Shares |  | Weighted- Average Exercise Price |  | Aggregate Intrinsic Value (in thousands)
Outstanding, at beginning of year | 39,088 |  |  | $ | 20.87 |  |  | $ | 2,433 |
Exercised | (19,544 | ) |  | $ | 20.87 |  |  | $ | 1,237 |
Forfeited | — |  |  | $ | — |  |  | $ | — |
Outstanding, at end of quarter | 19,544 |  |  | $ | 20.87 |  |  | $ | 1,117 |
Vested and exercisable, at end of quarter | 19,544 |  |  | $ | 20.87 |  |  | $ | 1,117 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of the status and activity of non-vested RSUs for the nine-month period ended September 30, 2014, is presented in the following table:
| RSUs |  | Weighted-Average Grant-Date Fair Value
Non-vested at beginning of year | 580,431 |  |  | $ | 57.05 |
Granted | 233,601 |  |  | $ | 84.11 |
Vested | (250,601 | ) |  | $ | 58.09 |
Forfeited | (32,736 | ) |  | $ | 59.07 |
Non-vested at end of quarter | 530,695 |  |  | $ | 68.34 |
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] | A summary of the status and activity of non-vested PSUs for the nine-month period ended September 30, 2014, is presented in the following table:
| PSUs (1) |  | Weighted-Average Grant-Date Fair Value
Non-vested at beginning of year | 572,469 |  |  | $ | 66.07 |
Granted | 202,404 |  |  | $ | 94.66 |
Vested | (115,784 | ) |  | $ | 59.30 |
Forfeited | (129,491 | ) |  | $ | 87.21 |
Non-vested at end of quarter | 529,598 |  |  | $ | 73.31 |
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(1) | The number of awards assumes a one multiplier. The final number of shares of common stock issued may vary depending on the three-year performance multiplier, which ranges from zero to two.
Schedule of Net Profits Plan Cash Payment Allocation | Cash payments made or accrued under the Company’s Net Profits Interest Bonus Plan (“Net Profits Plan”) that have been recorded as either G&A expense or exploration expense are presented in the table below:
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
| (in thousands)
General and administrative expense | $ | 2,487 |  |  | $ | 4,302 |  |  | $ | 7,451 |  |  | $ | 11,531 |
Exploration expense | 162 |  |  | 329 |  |  | 644 |  |  | 1,026 |
Total | $ | 2,649 |  |  | $ | 4,631 |  |  | $ | 8,095 |  |  | $ | 12,557 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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