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Weighted Average Shares Outstanding and Net Income (Loss) Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table presents a reconciliation of the weighted average shares outstanding used in calculating basic and diluted net income per share as well as the calculation of basic and diluted net loss per share:
 
 
Three Months Ended March 31,
(in thousands, except per share amounts)
 
2017
 
2016
Numerator (basic and diluted):
 
 
 
 

Net loss allocated to common shareholders for basic calculation
 
$
(23,790
)
 
$
(10,441
)
Denominator:
 
 
 
 

Weighted average common shares outstanding, basic 
 
39,649

 
39,433

Dilutive effect of common stock options and restricted stock units1
 
—

 
—

Weighted average common shares outstanding, diluted
 
39,649

 
39,433

Net loss per share, basic
 
$
(0.60
)
 
$
(0.26
)
Net loss per share, diluted
 
$
(0.60
)
 
$
(0.26
)

1Due to the net loss for the three months ended March 31, 2017 and 2016, restricted stock units and common stock options representing approximately 673,000 and 544,000, respectively, have been excluded from the number of shares used in calculating diluted net loss per share, as their inclusion would be antidilutive.