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Earnings Per Share
 12 Months Ended
Dec. 31, 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):
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
 
 
 
 
 
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
(99,250
)
 
$
57,298

 
$
31,770

 
 
 
 
 
 
Weighted average common shares outstanding - Basic
39,244

 
38,655

 
38,207

Dilutive effect of stock-based awards
—

 
732

 
436

Weighted average common shares outstanding - Diluted
39,244

 
39,387

 
38,643

 
 
 
 
 
 
Earnings (loss) per common share - Basic
$
(2.53
)
 
$
1.48

 
$
0.83

Earnings (loss) per common share - Diluted
$
(2.53
)
 
$
1.45

 
$
0.82



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 our common stock at the average market price during the period. Related proceeds include the amount the employee must pay upon exercise and future compensation cost associated with the stock award. Approximately
1.1 million, 0.2 million, and 0.7 million shares related to stock-based awards were excluded from the calculation of diluted EPS for the years ended December 31, 2018, 2017, and 2016, respectively, because they were anti-dilutive. These stock-based awards could be dilutive in future periods.