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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
The following table shows a summary of the Company's quarterly financial information for each of the quarters in the two-year period ended December 31, 2019:
 
Three Months Ended
 
Dec. 31,
2019
 
Sep. 30,
 2019
 
Jun. 30,
2019
 
Mar. 31,
2019
 
Dec. 31,
2018
 
Sep. 30,
 2018
 
Jun. 30,
2018
 
Mar. 31,
2018
 
(unaudited)
 
(in thousands, except per share data)
Revenues
$
84,664

 
$
82,671

 
$
78,929

 
$
75,343

 
$
74,200

 
$
71,658

 
$
68,153

 
$
64,878

Income from operations
19,545

 
22,549

 
16,108

 
14,051

 
12,943

 
18,117

 
10,895

 
8,406

Other income (expense), net
1,757

 
1,786

 
2,401

 
1,786

 
1,862

 
1,116

 
884

 
1,245

Income before income taxes
21,302

 
24,335

 
18,509

 
15,837

 
14,805

 
19,233

 
11,779

 
9,651

Net income
$
20,664

 
$
19,174

 
$
16,232

 
$
13,266

 
$
14,400

 
$
23,469

 
$
10,293

 
$
9,142

Net income per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.53

 
$
0.49

 
$
0.41

 
$
0.34

 
$
0.37

 
$
0.60

 
$
0.26

 
$
0.24

Diluted
$
0.50

 
$
0.47

 
$
0.39

 
$
0.32

 
$
0.35

 
$
0.56

 
$
0.24

 
$
0.22