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Quarterly Financial Summary (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of unaudited quarterly financial information
The following tables set forth selected unaudited quarterly financial information for each of the Company’s last eight quarters:

 
1st Quarter
 
2nd Quarter
 
3rd Quarter
 
4th Quarter
 
(in thousands, except per share data)
2017
 
 
 
 
 
 
 
Revenue
$
75,688

 
$
72,196

 
$
73,279

 
$
78,085

Income from operations before income taxes
8,318

 
6,333

 
7,616

 
12,777

Net income
4,509

 
3,829

 
4,366

 
8,417

Net income per common share:
 
 
 
 
 
 
 
Basic
$
0.28

 
$
0.24

 
$
0.27

 
$
0.52

Diluted
$
0.28

 
$
0.23

 
$
0.27

 
$
0.51

2016
 
 
 
 
 
 
 
Revenue
$
83,966

 
$
76,745

 
$
73,803

 
$
78,625

Income from operations before income taxes
16,007

 
10,697

 
429

 
11,259

Net income
10,340

 
6,596

 
326

 
6,893

Net income per common share:
 
 
 
 
 
 
 
Basic
$
0.64

 
$
0.41

 
$
0.02

 
$
0.43

Diluted
$
0.64

 
$
0.41

 
$
0.02

 
$
0.42