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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Data [Abstract]  
Quarterly Financial Data (Unaudited)
Quarterly Financial Data (Unaudited)
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
 
(in thousands, except per share data)
2015
 
 
 
 
 
 
 
 
 
Revenue
$
82,373

 
$
87,030

 
$
87,942

 
$
77,014

 
$
334,359

Gross margin
26,527

 
29,252

 
31,227

 
28,104

 
115,110

Net income (loss)
(1,515
)
 
(12,547
)
 
1,975

 
(1,375
)
 
(13,462
)
Earnings (loss) per share(1):
 
 
 
 
 
 
 
 
 
Basic
$
(0.03
)
 
$
(0.23
)
 
$
0.04

 
$
(0.03
)
 
$
(0.25
)
Diluted
$
(0.03
)
 
$
(0.23
)
 
$
0.04

 
$
(0.03
)
 
$
(0.25
)
 
 
 
 
 
 
 
 
 
 
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

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