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Earnings per Share (Note)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Earnings per Share
Earnings per Share

The following table sets forth the computation of basic and diluted earnings per share for the three and six months ended June 30, 2016 and 2015:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in thousands, except per share data)
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net loss
$
(20,527
)
 
$
(15,668
)
 
$
(41,004
)
 
$
(29,898
)
Denominator:
 
 
 
 
 
 
 
Weighted average shares (basic)
30,330

 
29,565

 
30,278

 
29,470

Dilutive effect of potential common shares
—

 
—

 
—

 
—

Weighted average shares (diluted)
30,330

 
29,565

 
30,278

 
29,470

Basic loss per share
$
(0.68
)
 
$
(0.53
)
 
$
(1.35
)
 
$
(1.01
)
Diluted loss per share
$
(0.68
)
 
$
(0.53
)
 
$
(1.35
)
 
$
(1.01
)

    
Dilutive potential common shares consist of shares issuable upon the exercise of stock options, settlement of SARs, and the vesting of RSUs and MSUs. Potential common shares determined to be antidilutive and excluded from diluted weighted average shares outstanding were approximately 2.0 million and 2.2 million for the three months ended June 30, 2016 and 2015, respectively, and 2.0 million and 2.1 million for the six months ended June 30, 2016 and 2015, respectively. Basic shares were used to calculate loss per share for the three and six months ended June 30, 2016 and 2015.

Since the Company has the intention and ability to settle the principal amount of its Senior Notes (see Note 5) in cash, the treasury stock method is expected to be used for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The conversion spread will have a dilutive impact on diluted net income per share of common stock when the average market price of common stock for a given period exceeds the conversion price of $33.79 per share.