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Basis of Presentation (Tables)
 3 Months Ended
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Options Activity
The following table summarizes the Company’s stock option activity for the three months ended March 31, 2014:
 
 
 
 
Number
of
Shares
 
Weighted
Average
 Option
 Exercise
 Price Per
 Share
 
Weighted
 Average
Grant
Date Fair
 Value
Per Share
 
Outstanding, December 31, 2013
 
5,400

 
$
2.77

 
$
1.98

 
Granted
 
923

 
3.15

 
2.28

 
Exercised
 
(59
)
 
2.07

 
1.31

 
Canceled
 
(29
)
 
3.23

 
2.30

 
Outstanding, March 31, 2014
 
6,235

 
$
2.83

 
$
1.99

 
Additional Information Related To Stock Options
Additional information related to stock options at March 31, 2014 and December 31, 2013 is as follows: 
 
 
March 31,
2014
 
December 31,
2013
 
Options exercisable                                                                                    
 
4,112

 
3,828

 
Restricted Stock Activity
The following table summarizes the Company’s restricted stock activity for the three months ended March 31, 2014: 
 
 
Number
of
Shares
 
Weighted
Average
Grant Date
Fair Value
Per Share
 
Unvested, December 31, 2013                                                
 
355

 
$
3.24

 
Granted                                                 
 
741

 
3.15

 
Vested/Released                                                 
 
—

 
4.88

 
Forfeited                                                 
 
(8
)
 
3.44

 
Unvested, March 31, 2014                                                 
 
1,088

 
$
3.18

 
Asset Retirement Obligation Transactions
The following table summarizes the Company’s asset retirement obligation transactions for the three months ended March 31, 2014 and the year ended December 31, 2013:
 
 
March 31,
 2014
 
December 31,
2013
 
Beginning asset retirement obligation
 
$
9,888

 
$
11,381

 
New wells placed on production and other
 
125

 
222

 
Deletions related to property disposals and plugging costs
 
(229
)
 
(2,491
)
 
Accretion expense
 
144

 
638

 
Revisions
 
(82
)
 
138

 
Ending asset retirement obligation
 
$
9,846

 
$
9,888

 
Restricted Stock [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock-Based Compensation Expense
The following table summarizes the Company’s stock-based compensation expense related to restricted stock for the periods presented:
 
Three Months Ended March 31,
 
2014
 
2013
 
$
133

 
$
112

 
Stock Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock-Based Compensation Expense
The following table summarizes the Company’s stock-based compensation expense related to stock options for the periods presented:
 
Three Months Ended March 31,
2014
 
2013
$
306

 
$
362