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Basis of Presentation and Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Components of Inventories
The components of inventory as of September 30, 2018 and December 31, 2017 consisted of the following:
In thousands
 
September 30, 2018
 
December 31, 2017
Tubular goods and equipment
 
$
15,829

 
$
14,946

Crude oil
 
88,401

 
82,460

Total
 
$
104,230

 
$
97,406
Calculation of Basic and Diluted Weighted Average Shares and Net Income Per Share
The following table presents the calculation of basic and diluted weighted average shares outstanding and net income (loss) per share for the three and nine months ended September 30, 2018 and 2017.
 
 
Three months ended September 30,
 
Nine months ended September 30,
In thousands, except per share data
 
2018
 
2017
 
2018
 
2017
Net income (loss) (numerator)
 
$
314,169

 
$
10,621

 
$
790,580

 
$
(52,467
)
Weighted average shares (denominator):
 
 
 
 
 
 
 
 
Weighted average shares - basic
 
371,960

 
371,142

 
371,810

 
371,029

Non-vested restricted stock (1)
 
2,663

 
1,873

 
2,952

 
—

Weighted average shares - diluted
 
374,623

 
373,015

 
374,762

 
371,029

Net income (loss) per share:
 
 
 
 
 
 
 
 
Basic
 
$
0.84

 
$
0.03

 
$
2.13

 
$
(0.14
)
Diluted
 
$
0.84

 
$
0.03

 
$
2.11

 
$
(0.14
)