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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Calculation of Earnings Per Share
The following table sets forth the calculation of EPS for the years ended December 31, 2018, 2017, and 2016 (in thousands, except per share amounts):
 
 
Years Ended December 31,
 
 
2018
 
2017
 
2016
Weighted average basic common shares outstanding
 
19,453

 
20,420

 
21,161

Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock
 
8

 
5

 
9

Weighted average dilutive common shares outstanding
 
19,461

 
20,425

 
21,170

Basic:
 
 
 
 
 
 
Net income (loss)
 
$
157,772

 
$
213,442

 
$
147,065

Less: Earnings (loss) allocated to participating securities
 
5,416

 
7,512

 
5,871

Earnings (loss) available to basic common shares
 
$
152,356

 
$
205,930

 
$
141,194

Basic earnings (loss) per common share
 
$
7.83

 
$
10.08

 
$
6.67

Diluted:
 
 
 
 
 
 
Net income (loss)
 
$
157,772

 
$
213,442

 
$
147,065

Less: Earnings (loss) allocated to participating securities
 
5,414

 
7,511

 
5,869

Earnings (loss) available to diluted common shares
 
$
152,358

 
$
205,931

 
$
141,196

Diluted earnings (loss) per common share
 
$
7.83

 
$
10.08

 
$
6.67