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SELECTED QUARTERLY INFORMATION - UNAUDITED (Tables)
 12 Months Ended
Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]  
Selected Quarterly Information
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
(In thousands, except per share data)
Total revenue, net:
 
 
 
 
 
 
 
2012
$
196,185

 
$
210,170

 
$
210,084

 
$
214,432

2011
181,041

 
193,329

 
202,185

 
203,523

Gross margin:
 
 
 
 
 
 
 
2012
$
121,510

 
$
131,896

 
$
130,536

 
$
132,502

2011
116,120

 
120,491

 
123,534

 
120,783

Net income (loss):
 
 
 
 
 
 
 
2012
$
6,693

 
$
8,514

 
$
13,211

 
$
12,786

2011
11,487

 
699

 
11,243

 
4,560

Basic net income (loss) per common share(1)(2):
 
 
 
 
 
 
 
2012
$
0.24

 
$
0.30

 
$
0.46

 
$
0.46

2011
0.39

 
0.02

 
0.39

 
0.16

Diluted net income (loss) per common share(1)(2):
 
 
 
 
 
 
 
2012
$
0.23

 
$
0.30

 
$
0.46

 
$
0.46

2011
0.38

 
0.02

 
0.39

 
0.16

(1)
Per common share amounts for the quarters and full years have been calculated separately. Accordingly, quarterly amounts do not necessarily add to the annual amount because of differences in the weighted average common shares outstanding during each period principally due to the effect of the Company’s issuing shares of its common stock during the year.
(2)
Certain of the Company’s unvested restricted share units contain rights to receive nonforfeitable dividends, and thus, are participating securities requiring the two-class method of computing earnings per share. The participating securities had an insignificant impact on the calculation of earnings per share (impacts the rounding by less than $0.01 per share) on all of the periods presented; therefore, the Company does not present the full calculation.