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Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Compensation Related Costs [Abstract] |  |
Schedule of performance share awards under equity incentive compensation plan | A summary of the status and activity of non-vested PSUs is presented in the following table:
| For the Years Ended December 31,
| 2015 |  | 2014 |  | 2013
| PSUs |  | Weighted-Average Grant-Date Fair Value |  | PSUs |  | Weighted-Average Grant-Date Fair Value |  | PSUs |  | Weighted-Average Grant-Date Fair Value
Non-vested at beginning of year (1) | 433,660 |  |  | $ | 73.63 |  |  | 572,469 |  |  | $ | 66.07 |  |  | 669,308 |  |  | $ | 63.91 |
Granted (1) | 320,753 |  |  | $ | 45.34 |  |  | 202,404 |  |  | $ | 94.66 |  |  | 274,831 |  |  | $ | 64.13 |
Vested (1) | (76,438 | ) |  | $ | 51.76 |  |  | (206,830 | ) |  | $ | 64.79 |  |  | (345,005 | ) |  | $ | 60.06 |
Forfeited (1) | (51,647 | ) |  | $ | 73.62 |  |  | (134,383 | ) |  | $ | 86.72 |  |  | (26,665 | ) |  | $ | 69.74 |
Non-vested at end of year(1) | 626,328 |  |  | $ | 61.81 |  |  | 433,660 |  |  | $ | 73.63 |  |  | 572,469 |  |  | $ | 66.07 |
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(1) | The number of awards assumes a multiplier of one. The final number of shares of common stock issued may vary depending on the three-year performance multiplier, which ranges from zero to two.
| [1]
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | A summary of the status and activity of non-vested RSUs is presented below:
| For the Years Ended December 31,
| 2015 |  | 2014 |  | 2013
| RSUs |  | Weighted- Average Grant-Date Fair Value |  | RSUs |  | Weighted- Average Grant-Date Fair Value |  | RSUs |  | Weighted- Average Grant-Date Fair Value
Non-vested at beginning of year | 515,724 |  |  | $ | 68.29 |  |  | 580,431 |  |  | $ | 57.05 |  |  | 496,244 |  |  | $ | 51.81 |
Granted | 356,246 |  |  | $ | 43.72 |  |  | 234,560 |  |  | $ | 83.98 |  |  | 329,939 |  |  | $ | 60.01 |
Vested | (278,289 | ) |  | $ | 63.12 |  |  | (253,031 | ) |  | $ | 58.19 |  |  | (207,376 | ) |  | $ | 49.73 |
Forfeited | (49,944 | ) |  | $ | 66.53 |  |  | (46,236 | ) |  | $ | 62.06 |  |  | (38,376 | ) |  | $ | 54.37 |
Non-vested at end of year | 543,737 |  |  | $ | 55.01 |  |  | 515,724 |  |  | $ | 68.29 |  |  | 580,431 |  |  | $ | 57.05 |
Schedule of stock option grants under prior stock option plans | A summary of activity associated with the Company’s Stock Option Plans during the years ended December 31, 2014, and 2013, is presented in the following table:
|  |  | Weighted - |  |
|  |  | Average |  | Aggregate
|  |  | Exercise |  | Intrinsic
| Shares |  | Price |  | Value
For the year ended December 31, 2013 |  |  |  |  |
Outstanding, start of year | 267,846 |  |  | $ | 14.95 |  |  |
Exercised | (228,758 | ) |  | $ | 13.92 |  |  | $ | 12,326,994 |
Forfeited | — |  |  | $ | — |  |  |
Outstanding, end of year | 39,088 |  |  | $ | 20.87 |  |  | $ | 2,432,837 |
Vested and exercisable at end of year | 39,088 |  |  | $ | 20.87 |  |  | $ | 2,432,837 |
For the year ended December 31, 2014 |  |  |  |  |
Outstanding, start of year | 39,088 |  |  | $ | 20.87 |  |  |
Exercised | (39,088 | ) |  | $ | 20.87 |  |  | $ | 1,993,726 |
Forfeited | — |  |  | $ | — |  |  |
Outstanding, end of year | — |  |  | $ | — |  |  | $ | — |
Vested and exercisable at end of year | — |  |  | $ | — |  |  | $ | — |
Schedule of employee stock purchase plan | The fair value of ESPP shares issued during the periods reported were estimated using the following weighted-average assumptions:
| For the Years Ended December 31,
| 2015 |  | 2014 |  | 2013
Risk free interest rate | 0.1 | % |  | 0.1 | % |  | 0.1 | %
Dividend yield | 0.2 | % |  | 0.1 | % |  | 0.2 | %
Volatility factor of the expected market price of the Company’s common stock | 61.2 | % |  | 33.0 | % |  | 41.1 | %
Expected life (in years) | 0.5 |  |  | 0.5 |  |  | 0.5 |
Schedule of net profits plan cash payment allocation | Cash payments made or accrued under the Net Profits Plan that have been recorded as either general and administrative expense or exploration expense are detailed in the table below:
| For the Years Ended December 31,
| 2015 |  | 2014 |  | 2013
| (in thousands)
General and administrative expense | $ | 3,239 |  |  | $ | 8,326 |  |  | $ | 13,734 |
Exploration expense | 259 |  |  | 690 |  |  | 1,310 |
Total | $ | 3,498 |  |  | $ | 9,016 |  |  | $ | 15,044 |
[1] | The number of awards assumes a multiplier of one. The final number of shares of common stock issued may vary depending on the three-year performance multiplier, which ranges from zero to two.

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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 significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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