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Earnings Per Share
 9 Months Ended
Sep. 30, 2018
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 September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
19,882

 
$
25,576

 
$
(123,127
)
 
$
55,518

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
39,340

 
38,713

 
39,177

 
38,624

Dilutive effect of stock-based awards
569

 
754

 
—

 
715

Weighted average common shares outstanding - Diluted
39,909

 
39,467

 
39,177

 
39,339

Earnings (loss) per common share - Basic
$
0.51

 
$
0.66

 
$
(3.14
)
 
$
1.44

Earnings (loss) per common share - Diluted
$
0.50

 
$
0.65

 
$
(3.14
)
 
$
1.41



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 1.1 million stock-based awards were excluded from the calculation of diluted EPS for the three and nine months ended September 30, 2018, respectively, because they were anti-dilutive. Approximately 0.2 million stock-based awards were excluded from the calculation of diluted EPS for both the three and nine months ended September 30, 2017 because they were anti-dilutive. These stock-based awards could be dilutive in future periods.