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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2014
Quarterly Financial Data [Abstract]  
Schedule of quarterly financial data
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
 
(in thousands, except per share data)
2014
 
 
 
 
 
 
 
 
 
Revenue
$
102,575

 
$
105,318

 
$
116,761

 
$
124,503

 
$
449,157

Gross margin
43,681

 
42,310

 
46,078

 
50,890

 
182,959

Net income
12,018

 
11,041

 
14,272

 
16,272

 
53,603

Earnings per share (1):
 
 
 
 
 
 
 
 
 
Basic
$
0.22

 
$
0.20

 
$
0.26

 
$
0.30

 
$
0.98

Diluted
$
0.22

 
$
0.20

 
$
0.26

 
$
0.29

 
$
0.97

 
 
 
 
 
 
 
 
 
 
2013
 
 
 
 
 
 
 
 
 
Revenue
$
78,243

 
$
93,586

 
$
98,388

 
$
100,848

 
$
371,065

Gross margin
32,630

 
37,594

 
37,502

 
39,801

 
147,527

Net income
7,765

 
8,440

 
8,968

 
11,005

 
36,178

Earnings per share (1):
 
 
 
 
 
 
 
 
 
Basic
$
0.16

 
$
0.17

 
$
0.17

 
$
0.21

 
$
0.70

Diluted
$
0.15

 
$
0.16

 
$
0.16

 
$
0.20

 
$
0.67

(1)    The sum of the quarterly earnings per share (basic and diluted) may not agree to the earnings per share for the year due to the timing of common stock issuances.