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Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of restricted stock unit incentive program under equity incentive compensation plan
A summary of the status and activity of non-vested RSUs for the nine-month period ended September 30, 2013, is presented in the following table:

 
RSUs
 
Weighted-Average
 Grant-Date
Fair Value
Non-vested at beginning of year
496,244

 
$
51.81

Granted
329,939

 
$
60.01

Vested
(206,509
)
 
$
49.73

Forfeited
(29,487
)
 
$
54.02

Non-vested at end of quarter
590,187

 
$
57.02
Schedule of performance share awards under equity incentive compensation plan
A summary of the status and activity of non-vested PSUs for the nine-month period ended September 30, 2013, is presented in the following table:
 
PSUs (1)
 
Weighted-Average
 Grant-Date
Fair Value
Non-vested at beginning of year
669,308

 
$
63.91

Granted
274,831

 
$
64.13

Vested
(343,307
)
 
$
59.99

Forfeited
(22,371
)
 
$
69.50

Non-vested at end of quarter
578,461

 
$
66.13

_______________________________________
(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 stock option grants under prior stock option plans
A summary of activity associated with the Company’s Stock Option Plan for the nine months ended September 30, 2013, is presented in the following table:
 
Shares
 
Weighted-
Average
Exercise Price
 
Aggregate
 Intrinsic Value (in thousands)
Outstanding, at beginning of year
267,846

 
$
14.95

 
$
9,983

Exercised
(177,995
)
 
$
13.89

 
$
8,753

Forfeited
—

 


 
 
Outstanding, at end of quarter
89,851

 
$
17.01

 
$
5,407

Vested and exercisable, at end of quarter
89,851

 
$
17.01

 
$
5,407
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,
 
2013
 
2012
 
2013
 
2012
 
(in thousands)
General and administrative expense
$
4,302

 
$
4,083

 
$
11,531

 
$
12,177

Exploration expense
329

 
403

 
1,026

 
1,421

Total
$
4,631

 
$
4,486

 
$
12,557

 
$
13,598