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(Loss) earnings per share
 3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
(Loss) earnings per share
The following table reflects the calculation of basic and diluted (loss) earnings per share. During each period, certain stock options, as noted below, were excluded from the calculation of diluted (loss) earnings per share because their effect would have been antidilutive. 
 
 
Quarter Ended March 31,
(in thousands, except per share amounts)
 
2020
 
2019
(Loss) earnings per share – basic:
 
 
 
 
Net (loss) income
 
$
(60,131
)
 
$
41,190

Income allocated to participating securities
 
(21
)
 
(110
)
(Loss) income available to common shareholders
 
$
(60,152
)
 
$
41,080

Weighted-average shares outstanding
 
42,028

 
43,965

(Loss) earnings per share – basic
 
$
(1.43
)
 
$
0.93

 
 
 
 
 
(Loss) earnings per share – diluted:
 
 

 
 

Net (loss) income
 
$
(60,131
)
 
$
41,190

Income allocated to participating securities
 
(21
)
 
(65
)
Re-measurement of share-based awards classified as liabilities
 
(775
)
 
—

(Loss) income available to common shareholders
 
$
(60,927
)
 
$
41,125

Weighted-average shares outstanding
 
42,028

 
43,965

Dilutive impact of potential common shares
 
37

 
100

Weighted-average shares and potential common shares outstanding
 
42,065

 
44,065

(Loss) earnings per share – diluted
 
$
(1.45
)
 
$
0.93

Antidilutive options excluded from calculation
 
2,214

 
1,097