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Basis of Presentation (Tables)
 6 Months Ended
Jun. 30, 2017
Accounting Policies [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the calculations of basic and diluted earnings per share:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in thousands, except per share amounts)
 
2017
 
2016
 
2017
 
2016
Net income
 
$
6,408

 
$
7,860

 
$
15,096

 
$
12,236

Less: Undistributed income allocated to participating securities
 
45

 
83

 
140

 
109

Income attributable to common stockholders
 
$
6,363

 
$
7,777

 
$
14,956

 
$
12,127

 
 
 
 
 
 
 
 
 
Basic weighted-average common shares outstanding
 
21,866

 
21,875

 
21,961

 
21,895

Add: dilutive effect of equity instruments
 
14

 
312

 
20

 
309

Diluted weighted-average shares outstanding
 
21,880

 
22,187

 
21,981

 
22,204

Earnings per share - basic
 
$
0.29

 
$
0.36

 
$
0.68

 
$
0.55

Earnings per share - diluted
 
$
0.29

 
$
0.35

 
$
0.68

 
$
0.55