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RECONCILIATION OF EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Reconciliation
Years ended December 31,
 
 
 
 
 
 
 
 
 
(in thousands, except per share amounts)
2017
 
 
2016
 
 
2015
 
 
Net
Income

Shares
Per Share Amount
Net
Loss

Shares
Per Share Amount
Net
Loss

Shares
Per Share Amount
Basic EPS
$
306,828

97,182

$
3.16

$
(167,513
)
94,476

$
(1.77
)
$
(945,731
)
76,078

$
(12.43
)
Effect of dilutive securities
 
 
 
 
 
 
 
 
 
Stock options
 
26

 
 
—

 
 
—

 
Non-vested restricted stock
 
300

 
 
—

 
 
—

 
Performance share awards
 
199

 
 
—

 
 
—

 
Diluted EPS
$
306,828

97,707

$
3.14

$
(167,513
)
94,476

$
(1.77
)
$
(945,731
)
76,078

$
(12.43
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
Energen had the following shares that were excluded from the computation of diluted EPS, as inclusion would be anti-dilutive.

Years ended December 31, (in thousands)
2017
2016
2015
Stock options
512

539

114

Performance share awards
131

—

—