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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Computation of Net Income Per Share, Basic and Diluted
The following table sets forth the computation of net income (loss) per share, on a basic and diluted basis, for the periods indicated (share count and dollar amounts other than per-share amounts in the table are in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
Basic:
 
 
 
 
 
 
 
Net income (loss)
$
(93,103
)
 
$
70,543

 
$
(126,113
)
 
$
127,667

Less income allocated to participating securities
—

 
(997
)
 
(236
)
 
(1,791
)
Net income (loss) attributable to common stock
$
(93,103
)
 
$
69,546

 
$
(126,349
)
 
$
125,876

Earnings (loss) per share, basic
$
(5.85
)
 
$
4.33

 
$
(7.93
)
 
$
7.85

Weighted-average shares outstanding
15,902

 
16,063

 
15,927

 
16,037

Diluted:
 

 
 

 
 

 
 

Net income (loss)
$
(93,103
)
 
$
70,543

 
$
(126,113
)
 
$
127,667

Less income allocated to participating securities
—

 
(996
)
 
(236
)
 
(1,790
)
Net income (loss) attributable to common stock
$
(93,103
)
 
$
69,547

 
$
(126,349
)
 
$
125,877

Earnings (loss) per share, diluted
$
(5.85
)
 
$
4.33

 
$
(7.93
)
 
$
7.84

Weighted-average shares outstanding
15,902

 
16,063

 
15,927

 
16,037

Dilutive effect of stock options and restricted stock
26

 
39

 
56

 
39

Adjusted weighted-average shares outstanding under treasury stock method
15,928

 
16,102

 
15,983

 
16,076

Participating securities excluded under two-class method
(26
)
 
(33
)
 
(56
)
 
(26
)
Adjusted weighted-average shares outstanding under two-class method
15,902

 
16,069

 
15,927

 
16,050