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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 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):
 
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