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Weighted Average Shares Outstanding and Net Incomer (Loss) Per Share
 6 Months Ended
Jun. 30, 2017
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:
 
 
Three Months Ended June 30,
Six Months Ended June 30,
(in thousands, except per share amounts)
 
2017
 
2016
 
2017
 
2016
Numerator (basic and diluted):
 
 
 
 

 
 
 
 
Net income (loss) allocated to common shareholders for basic calculation
 
$
14,133

 
$
14,199

 
$
(9,657
)
 
$
3,758

Denominator:
 
 
 
 

 
 
 
 
Weighted average common shares outstanding, basic 
 
39,827

 
39,584

 
39,738

 
39,509

Dilutive effect of common stock options and restricted stock units1
 
566

 
718

 
—

 
631

Weighted average common shares outstanding, diluted
 
40,393

 
40,302

 
39,738

 
40,140

Net income (loss) per share, basic
 
$
0.35

 
$
0.36

 
$
(0.24
)
 
$
0.10

Net income (loss) per share, diluted
 
$
0.35

 
$
0.35

 
$
(0.24
)
 
$
0.09


1Due to the net loss for the six months ended June 30, 2017, restricted stock units of approximately 618,000 have been excluded from the number of shares used in calculating diluted net loss per share, as their inclusion would be antidilutive.