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Earnings per Share
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Earnings per Share Earnings (Loss) per Share

Basic and diluted earnings (loss) per share are computed pursuant to the two-class method. Under this method, the Company attributes net income (loss) to two classes: common stock and unvested restricted stock. Unvested restricted stock awards granted to employees under the Company’s Long-Term Incentive Plan are considered participating securities as they receive non-forfeitable rights to cash dividends at the same rate as common stock.

Diluted net income (loss) per share is calculated using the more dilutive of the two methods. Under both methods, the exercise of employee stock options is assumed using the treasury stock method. The assumption of vesting of restricted stock, however, differs:

1.
Assume vesting of restricted stock using the treasury stock method.

2.
Assume unvested restricted stock awards are not vested, and allocate earnings to common shares and unvested restricted stock awards using the two-class method.

For the three and six months ended June 30, 2019, respectively, the second method, which assumes unvested awards are not vested, was used in the computation because it was more dilutive than the first method.

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