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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share [Table Text Block]
The following table sets forth the computation of basic and diluted earnings (loss) per share (EPS):
 
Three Months Ended March 31,
 
2018
 
2017
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
(145,666
)
 
$
15,845

 
 
 
 
Weighted average common shares outstanding - Basic
38,945

 
38,474

Dilutive effect of stock-based awards
—

 
741

Weighted average common shares outstanding - Diluted
38,945

 
39,215

Earnings (loss) per common share - Basic
$
(3.74
)
 
$
0.41

Earnings (loss) per common share - Diluted
$
(3.74
)
 
$
0.40