XML 53 R33.htm IDEA: XBRL DOCUMENT v3.3.1.900
Compensation Plans (Tables)
 12 Months Ended
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

____________________________________________
(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.