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Earnings (loss) per share
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Earnings (loss) per share
Earnings (loss) per share
Basic earnings (loss) per share ("EPS") amounts are calculated by dividing net income (loss) allocated to common stockholders by the weighted average number of common shares outstanding. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive common shares outstanding.
The following table shows the basic and diluted earnings (loss) per share for the three months ended March 31, 2016 and 2015:
 
 
 
 
 
 
 
 
 
For the three months ended March 31,
 
2016
 
2015
 
Loss
Shares (000)
Per-Share
 
Income
Shares (000)
Per-Share
Net income (loss)
$
(16,163
)
 
 
 
$
73,779

 
 
Amount allocated to common stockholders
100.00
%
 
 
 
91.91
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders
(16,163
)
87,040

$
(0.19
)
 
67,813

88,814

$
0.76

Effect of Dilutive Securities:
 
 
 
 
 
 
 
Share-based compensation plans
—

—

 
 
—

555

 
Diluted EPS:
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders
$
(16,163
)
87,040

$
(0.19
)
 
$
67,813

89,369

$
0.76



Securities excluded from the calculation of diluted EPS:
Three months ended March 31,
 
2016
2015
 
 
 
Stock options (1)
393,237

333,266

Service-based share awards (1)
498,809

—

(1)
In periods when we report a net loss, all share awards are excluded from the calculation of diluted weighted average shares outstanding because of their antidilutive effect on earnings (loss) per share. In periods when we report net income, certain option awards may be excluded from the calculation of diluted EPS if the exercise price of the option award was greater than the average market price of the underlying common stock.