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Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2013
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,
| 2013 |  | 2012 |  | 2011
| 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) | 669,308 |  |  | $ | 63.91 |  |  | 885,894 |  |  | $ | 57.52 |  |  | 1,110,666 |  |  | $ | 39.48 |
Granted(1) | 274,831 |  |  | $ | 64.13 |  |  | 314,853 |  |  | $ | 51.98 |  |  | 266,282 |  |  | $ | 91.45 |
Vested(1) | (345,005 | ) |  | $ | 60.06 |  |  | (493,679 | ) |  | $ | 44.72 |  |  | (364,172 | ) |  | $ | 35.74 |
Forfeited(1) | (26,665 | ) |  | $ | 69.74 |  |  | (37,760 | ) |  | $ | 65.35 |  |  | (126,882 | ) |  | $ | 33.32 |
Non-vested at end of year(1) | 572,469 |  |  | $ | 66.07 |  |  | 669,308 |  |  | $ | 63.91 |  |  | 885,894 |  |  | $ | 57.52 |
(1) | The number of awards assumes a one multiplier. The final number of shares of common stock issued may vary depending on the ending three-year performance multiplier, which ranges from zero to two.
| [1]
Schedule of restricted stock unit incentive program under equity incentive compensation plan | A summary of the status and activity of non-vested RSUs is presented below:
| For the Years Ended December 31,
| 2013 |  | 2012 |  | 2011
| 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 | 496,244 |  |  | $ | 51.81 |  |  | 308,877 |  |  | $ | 44.33 |  |  | 333,359 |  |  | $ | 31.16 |
Granted | 329,939 |  |  | $ | 60.01 |  |  | 379,332 |  |  | $ | 49.47 |  |  | 98,952 |  |  | $ | 72.69 |
Vested | (207,376 | ) |  | $ | 49.73 |  |  | (166,672 | ) |  | $ | 32.72 |  |  | (105,820 | ) |  | $ | 30.61 |
Forfeited | (38,376 | ) |  | $ | 54.37 |  |  | (25,293 | ) |  | $ | 51.06 |  |  | (17,614 | ) |  | $ | 36.80 |
Non-vested at end of year | 580,431 |  |  | $ | 57.05 |  |  | 496,244 |  |  | $ | 51.81 |  |  | 308,877 |  |  | $ | 44.33 |
Schedule of stock option grants under prior stock option plans | A summary of activity associated with the Company’s Stock Option Plans during the last three years is presented in the following table:
|  |  | Weighted - |  |
|  |  | Average |  | Aggregate
|  |  | Exercise |  | Intrinsic
| Shares |  | Price |  | Value
For the year ended December 31, 2011 |  |  |  |  |
Outstanding, start of year | 920,765 |  |  | $ | 13.11 |  |  |
Exercised | (412,551 | ) |  | $ | 12.19 |  |  | $ | 24,359,240 |
Forfeited | — |  |  | $ | — |  |  |
Outstanding, end of year | 508,214 |  |  | $ | 13.86 |  |  | $ | 30,109,110 |
Vested and exercisable at end of year | 508,214 |  |  | $ | 13.86 |  |  | $ | 30,109,110 |
For the year ended December 31, 2012 |  |  |  |  |
Outstanding, start of year | 508,214 |  |  | $ | 13.86 |  |  |
Exercised | (240,368 | ) |  | $ | 12.65 |  |  | $ | 11,842,575 |
Forfeited | — |  |  | $ | — |  |  |
Outstanding, end of year | 267,846 |  |  | $ | 14.95 |  |  | $ | 9,983,177 |
Vested and exercisable at end of year | 267,846 |  |  | $ | 14.95 |  |  | $ | 9,983,177 |
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 |
Schedule of options, vested and expected to vest | A summary of additional information related to options outstanding as of December 31, 2013, follows:
|  | Options Outstanding and Exercisable
|  | Number |  | Weighted-
|  | Of Options |  | Average
|  | Outstanding |  | Remaining
Exercise |  | and |  | Contractual
Price(1) |  | Exercisable |  | Life (in years)
$ | 20.87 |  |  | 39,088 |  |  | 1
Total |  | 39,088 |  |  |
(1) Exercise price is equal to the weighted average exercise price. | [1],[2]
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,
| 2013 |  | 2012 |  | 2011
Risk free interest rate | 0.1 | % |  | 0.1 | % |  | 0.2 | %
Dividend yield | 0.2 | % |  | 0.2 | % |  | 0.2 | %
Volatility factor of the expected market |  |  |  |  |
price of the Company’s common stock | 41.1 | % |  | 47.8 | % |  | 36.3 | %
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,
| 2013 |  | 2012 |  | 2011
| (in thousands)
General and administrative expense | $ | 13,734 |  |  | $ | 15,565 |  |  | $ | 19,326 |
Exploration expense | 1,310 |  |  | 1,751 |  |  | 2,091 |
Total | $ | 15,044 |  |  | $ | 17,316 |  |  | $ | 21,417 |
[1] | The number of awards assumes a one multiplier. The final number of shares of common stock issued may vary depending on the ending three-year performance multiplier, which ranges from zero to two.
[2] | Exercise price is equal to the weighted average exercise price.

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