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Net income (loss) per common share
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Net income (loss) per common share Net income (loss) per common share
Basic net income (loss) per common share is computed by dividing net income (loss) by the weighted-average common shares outstanding for the period. Diluted net income (loss) per common share reflects the potential dilution of non-vested restricted stock awards, outstanding stock option awards, non-vested performance share awards and the non-vested outperformance share award. See Note 6.c for additional discussion of these awards. All of these awards were anti-dilutive due to the Company's net loss and, therefore, were excluded from the calculation of diluted net income (loss) per common share for the three and nine months ended September 30, 2019. The dilutive effects of these awards were calculated utilizing the treasury stock method for the three and nine months ended September 30, 2018. See Note 10 in the third-quarter 2018 Quarterly Report for discussion of the awards excluded from the calculation of diluted net income (loss) per common share for the three and nine months ended September 30, 2018.
 
The following table reflects the calculations of basic and diluted (i) weighted-average common shares outstanding and (ii) net income (loss) per common share for the periods presented:
 
 
Three months ended September 30,
 
Nine months ended September 30,
(in thousands, except for per share data)
 
2019
 
2018
 
2019
 
2018
Net income (loss) (numerator):
 
 
 
 
 
 

 
 

Net income (loss)
 
$
(264,629
)
 
$
55,050

 
$
(100,738
)
 
$
175,022

Weighted-average common shares outstanding (denominator):
 
 
 
 
 
 
 
 
Basic(1)
 
231,562


230,605

 
231,152

 
233,228

Dilutive non-vested restricted stock awards
 
—

 
935

 
—

 
911

Dilutive outstanding stock option awards
 
—

 
99

 
—

 
68

Diluted
 
231,562


231,639

 
231,152

 
234,207

Net income (loss) per common share:
 
 
 
 
 
 
 
 

Basic
 
$
(1.14
)
 
$
0.24

 
$
(0.44
)
 
$
0.75

Diluted
 
$
(1.14
)
 
$
0.24

 
$
(0.44
)
 
$
0.75

_____________________________________________________________________________
(1)
Weighted-average common shares outstanding used in the calculation of basic and diluted net income (loss) per common share was computed taking into account share repurchases that occurred during the three and nine months ended September 30, 2018. See Note 6.a for additional discussion of the Company's share repurchase program.
See Note 17 for discussion of certain expected fourth-quarter 2019 forfeitures that did not affect diluted weighted-average common shares outstanding for the three or nine months ended September 30, 2019.