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Earnings (loss) per share
 12 Months Ended
Dec. 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 2016, 2015, and 2014:
 
For the year ended December 31, 2016
 
Net loss
Shares (000)
Per-Share
Net loss
$
(252,415
)
 
 
Amount allocated to common stockholders
100
%
 

 
Basic and Diluted EPS:
 

 

 
Net loss allocated to common stockholders
$
(252,415
)
87,064

$
(2.90
)

 
For the year ended December 31, 2015
 
Net loss
Shares (000)
Per-Share
Net loss
$
(59,310
)
 

 
Amount allocated to common stockholders
100
%
 

 
Basic and Diluted EPS:
 

 

 
Net loss allocated to common stockholders
$
(59,310
)
87,375

$
(0.68
)

 
For the year ended December 31, 2014
 
Net income
Shares (000)
Per-Share
Net income
$
126,474

 

 
Amount allocated to common stockholders
91.81
%
 

 
Basic EPS:
 

 

 
Net income allocated to common stockholders
$
116,116

88,823

$
1.31

Effect of dilutive securities:
 
 
 
Share-based compensation plans
 
605

 
Diluted EPS:
$
116,116

89,428

$
1.30



Securities excluded from the calculation of diluted EPS:
 
 
 
 
2016
2015
2014
Stock options (1)
105,453

356,634

320,553

Service-based share awards (1)
840,402

608,914

—

 
(1)
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 earnings (loss) per share.