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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Diluted 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,
 
2018
 
2017
 
2018
 
2017
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
2,657

 
$
14,097

 
$
(143,009
)
 
$
29,942

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
39,243

 
38,683

 
39,095

 
38,579

Dilutive effect of stock-based awards
546

 
649

 
—

 
695

Weighted average common shares outstanding - Diluted
39,789

 
39,332

 
39,095

 
39,274

Earnings (loss) per common share - Basic
$
0.07

 
$
0.36

 
$
(3.66
)
 
$
0.78

Earnings (loss) per common share - Diluted
$
0.07

 
$
0.36

 
$
(3.66
)
 
$
0.76