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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table presents the calculation of net earnings per common share (“EPS”) — basic and diluted (in thousands, except per share data): 
 
Three months ended
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Net (loss) income
$
(37,060
)
 
$
16,606

 
$
18,803

 
$
34,766

Weighted-average number of common shares outstanding (for basic calculation)
19,821

 
16,091

 
19,153

 
16,070

Dilutive securities
—

 
909

 
1,159

 
894

Weighted-average common and common equivalent shares outstanding (for diluted calculation)
19,821

 
17,000

 
20,312


16,964

EPS — basic
$
(1.87
)
 
$
1.03

 
$
0.98

 
$
2.16

EPS — diluted
$
(1.87
)
 
$
0.98

 
$
0.93

 
$
2.05