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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
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 September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands, except per share data)
Net income (loss) available to common shareholders
$
25,576

 
$
(9,885
)
 
$
55,518

 
$
20,121

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
38,713

 
38,248

 
38,624

 
38,181

Dilutive effect of stock-based awards
754

 
—

 
715

 
334

Weighted average common shares outstanding - Diluted
39,467

 
38,248

 
39,339

 
38,515

Earnings (loss) per common share - Basic
$
0.66

 
$
(0.26
)
 
$
1.44

 
$
0.53

Earnings (loss) per common share - Diluted
$
0.65

 
$
(0.26
)
 
$
1.41

 
$
0.52