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Compensation Plans (Tables)
 12 Months Ended
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.