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Earnings (loss) per share
 3 Months Ended
Mar. 31, 2017
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 securities.
In periods when we report a net loss, all share-based compensation awards are excluded from the calculation of diluted weighted average shares outstanding because of their antidilutive effect on loss per share. In periods when we report net income, certain share-based compensation awards may be excluded from the calculation of diluted EPS if the exercise price was greater than the average market price of the underlying common stock.
The following table shows the basic and diluted earnings (loss) per share for the three months ended March 31, 2017 and 2016:
 
For the three months ended March 31,
 
2017
 
2016
 
Loss
Shares (000)
Per-Share
 
Loss
Shares (000)
Per-Share
Net loss
$
(15,139
)
 
 
 
$
(16,163
)
 
 
Amount allocated to common stockholders
100.00
%
 
 
 
100.00
%
 
 
Basic and diluted EPS:
 
 
 
 
 
 
 
Net loss allocated to common stockholders
$
(15,139
)
87,254

$
(0.17
)
 
$
(16,163
)
87,040

$
(0.19
)



Securities excluded from the calculation of diluted EPS:
Three months ended March 31,
 
2017
2016
 
 
 
Stock options
207,716

393,237

Service-based share awards
1,037,320

498,809