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Weighted Average Shares Outstanding and Net Income (Loss) Per Share (Notes)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
Weighted Average Shares Outstanding and Net Income (Loss) Per Share
The following table presents a reconciliation of the weighted average shares outstanding used in calculating basic and diluted net income (loss) per share as well as the calculation of basic and diluted net income (loss) per share (in thousands except per share amounts):
Years Ended December 31,
 
2015
 
2014
 
2013
Numerator (basic and diluted):
 
 
 
 

 
 
Net income (loss) allocated to common shareholders for basic calculation
 
$
60,485

 
$
25,346

 
$
(36,423
)
 
 
 
 
 
 
 
Denominator:
 
 
 
 

 
 
Weighted average common shares outstanding, basic 
 
39,337

 
39,096

 
38,803

Dilutive effect of stock options and restricted stock units1
 
531

 
699

 
—

Weighted average common shares outstanding, diluted
 
39,868

 
39,795

 
38,803

Net income (loss) per share, basic
 
$
1.54

 
$
0.65

 
$
(0.94
)
Net income (loss) per share, diluted
 
$
1.52

 
$
0.64

 
$
(0.94
)

1Due to the net loss for the year ended December 31, 2013, restricted stock units and common stock options representing approximately 862,000 have been excluded from the number of shares used in calculating diluted net loss per share, as their inclusion would be antidilutive.