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Net Income Per Share:
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Net Income Per Share [Text Block]
Net Income Per Share
 
Basic earnings per share is computed by dividing net income by the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income by the weighted-average number of common shares outstanding during the period plus dilutive securities. Dilutive securities include outstanding common stock options and unvested restricted stock units, less the number of shares that could have been purchased with the proceeds from the exercise of the options, using the treasury stock method. Options that are anti-dilutive, where their exercise price exceeds the average market price of the common stock are not included in the treasury stock method calculation. There were no and 61 anti-dilutive securities for the three and six months ended June 30, 2017, respectively. There were no and 4,300 anti-dilutive securities for the three and six months ended June 30, 2016, respectively.

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