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Earnings per Share (Note)
 6 Months Ended
Jun. 30, 2017
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, 2017 and 2016:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in thousands, except per share data)
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net loss
$
(19,513
)
 
$
(20,527
)
 
$
(39,720
)
 
$
(41,004
)
Denominator:
 
 
 
 
 
 
 
Weighted average shares (basic)
31,615

 
30,330

 
31,357

 
30,278

Dilutive effect of potential common shares
—

 
—

 
—

 
—

Weighted average shares (diluted)
31,615

 
30,330

 
31,357

 
30,278

Basic loss per share
$
(0.62
)
 
$
(0.68
)
 
$
(1.27
)
 
$
(1.35
)
Diluted loss per share
$
(0.62
)
 
$
(0.68
)
 
$
(1.27
)
 
$
(1.35
)

    
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 2.1 million and 2.0 million for the three months ended June 30, 2017 and 2016, respectively, and 2.2 million and 2.0 million for the six months ended June 30, 2017 and 2016, respectively. Basic shares were used to calculate loss per share for the three and six months ended June 30, 2017 and 2016.

Since the Company has the intention and ability to settle the principal amount of its 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 and $48.63 per share, for the 2019 Notes and 2047 Notes, respectively.