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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table presents the calculation of net earnings (loss) per common share (“EPS”) — basic and diluted (in thousands, except per share data): 
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2018
 
2017
 
2018
 
2017
Net income (loss)
$
31,054

 
$
(37,060
)
 
$
35,929

 
$
18,803

Weighted-average number of common shares outstanding (for basic calculation)
20,352

 
19,821

 
20,304

 
19,153

Dilutive securities
1,217

 
—

 
1,232

 
1,159

Weighted-average common and common equivalent shares outstanding (for diluted calculation)
21,569

 
19,821

 
21,536


20,312

EPS — basic
$
1.53

 
$
(1.87
)
 
$
1.77

 
$
0.98

EPS — diluted
$
1.44

 
$
(1.87
)
 
$
1.67

 
$
0.93