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Earnings Per Share
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share

The following table sets forth the computation of basic and diluted earnings (loss) per share (EPS):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
In thousands, except per share data
2019
 
2018
 
2019
 
2018
Net income (loss) available to common shareholders
$
19,446

 
$
2,657

 
$
17,539

 
$
(143,009
)
 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
39,389

 
39,243

 
39,523

 
39,095

Dilutive effect of stock-based awards
297

 
546

 
352

 
—

Weighted average common shares outstanding - Diluted
39,686

 
39,789

 
39,875

 
39,095

Net income (loss) per common share - Basic
$
0.49

 
$
0.07

 
$
0.44

 
$
(3.66
)
Net income (loss) per common share - Diluted
$
0.49

 
$
0.07

 
$
0.44

 
$
(3.66
)


Stock-based Awards
For stock-based awards, the dilutive effect is calculated using the treasury stock method. Under this method, the dilutive effect is computed as if the awards were exercised at the beginning of the period (or at time of issuance, if later) and assumes the related proceeds were used to repurchase common stock at the average market price during the period. Related proceeds include the amount the employee must pay upon exercise and the future compensation cost associated with the stock award. Approximately 0.5 million and 0.6 million stock-based awards were excluded from the calculation of diluted EPS for the three and six months ended June 30, 2019 because they were anti-dilutive. Approximately 0.7 million and 1.1 million stock-based awards were excluded from the calculation of diluted EPS for the three and six months ended June 30, 2018 because they were anti-dilutive. These stock-based awards could be dilutive in future periods.