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Supplemental quarterly financial information (unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Supplemental quarterly financial information (unaudited)
Supplemental quarterly financial information (unaudited)

The following tables present a summary of our unaudited interim results of operations:
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2019
 
 
 
 
 
 
 
 
Total revenues
 
$
49,817

 
$
67,905

 
$
52,637

 
$
65,986

Operating loss
 
$
(47,510
)
 
$
(57,268
)
 
$
(146,445
)
 
$
(158,128
)
Net loss
 
$
(103,540
)
 
$
(45,229
)
 
$
(130,935
)
 
$
(189,244
)
Earnings per share:
 
 
 
 
 
 
 
 
Basic for Class A and Class B
 
(2.28
)
 
$
(0.99
)
 
$
(2.86
)
 
$
(4.14
)
Diluted for Class A and Class B
 
(2.28
)
 
$
(0.99
)
 
$
(2.86
)
 
$
(4.14
)
____________________________________________________________
(1)
Includes loss on impairment of oil and natural gas properties of $49,722, $63,593, $147,686 and $169,694 for the first, second, third and fourth quarter of 2019, respectively.

 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2018
 
 
 
 
 
 
 
 
Total revenues
 
$
59,087

 
$
59,625

 
$
66,718

 
$
61,932

Operating income (loss) (1)
 
$
8,426

 
$
12,024

 
$
18,312

 
$
(8,585
)
Net (loss) income
 
$
(11,442
)
 
$
(21,993
)
 
$
(12,068
)
 
$
78,945

Earnings per share:
 
 

 
 

 
 

 
 

Basic for Class A and Class B (2)
 
(0.25
)
 
$
(0.49
)
 
$
(0.27
)
 
$
1.74

Diluted for Class A and Class B (2)
 
(0.25
)
 
$
(0.49
)
 
$
(0.27
)
 
$
1.73

____________________________________________________________
(1)
Includes loss on impairment of oil and natural gas properties of $20,065 for the fourth quarter.
(2)
On December 19, 2018, all outstanding shares of Class B common stock converted into the same number of shares of Class A common stock.