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Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Stock Option Grants Under the Equity Incentive Compensation Plan

A summary of activity associated with the Company’s Stock Option Plan for the nine months ended September 30, 2014, is presented in the following table:
 
Shares
 
Weighted-
Average
Exercise Price
 
Aggregate
 Intrinsic Value (in thousands)
Outstanding, at beginning of year
39,088

 
$
20.87

 
$
2,433

Exercised
(19,544
)
 
$
20.87

 
$
1,237

Forfeited
—

 
$
—

 
$
—

Outstanding, at end of quarter
19,544

 
$
20.87

 
$
1,117

Vested and exercisable, at end of quarter
19,544

 
$
20.87

 
$
1,117
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
A summary of the status and activity of non-vested RSUs for the nine-month period ended September 30, 2014, is presented in the following table:

 
RSUs
 
Weighted-Average
 Grant-Date
Fair Value
Non-vested at beginning of year
580,431

 
$
57.05

Granted
233,601

 
$
84.11

Vested
(250,601
)
 
$
58.09

Forfeited
(32,736
)
 
$
59.07

Non-vested at end of quarter
530,695

 
$
68.34
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]
A summary of the status and activity of non-vested PSUs for the nine-month period ended September 30, 2014, is presented in the following table:
 
PSUs (1)
 
Weighted-Average
 Grant-Date
Fair Value
Non-vested at beginning of year
572,469

 
$
66.07

Granted
202,404

 
$
94.66

Vested
(115,784
)
 
$
59.30

Forfeited
(129,491
)
 
$
87.21

Non-vested at end of quarter
529,598

 
$
73.31

_______________________________________
(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 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,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
General and administrative expense
$
2,487

 
$
4,302

 
$
7,451

 
$
11,531

Exploration expense
162

 
329

 
644

 
1,026

Total
$
2,649

 
$
4,631

 
$
8,095

 
$
12,557