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Supplementary Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Supplementary Financial Data
 
 
Quarters Ended
(In thousands, except per share amounts)
 
March 31,
2012
 
June 30,
2012
 
September 30,
2012
 
December 31,
2012
Net revenue
 
$
301,355

 
$
318,990

 
$
335,985

 
$
352,909

Cost of revenue
 
$
100,081

 
$
102,572

 
$
107,348

 
$
109,012

Gross profit
 
$
201,274

 
$
216,418

 
$
228,637

 
$
243,897

Net income
 
$
23,180

 
$
25,134

 
$
27,197

 
$
29,907

Earnings per share - basic
 
$
0.17

 
$
0.19

 
$
0.20

 
$
0.22

Earnings per share - diluted
 
$
0.17

 
$
0.18

 
$
0.19

 
$
0.21

Cash and cash equivalents
 
$
186,531

 
$
215,448

 
$
257,651

 
$
292,061


 
 
Quarters Ended
(In thousands, except per share amounts)
 
March 31,
2013
 
June 30,
2013
 
September 30,
2013
 
December 31,
2013
Net revenue
 
$
362,200

 
$
375,847

 
$
388,636

 
$
408,103

Cost of revenue
 
$
113,610

 
$
117,658

 
$
127,404

 
$
133,821

Gross profit
 
$
248,590

 
$
258,189

 
$
261,232

 
$
274,282

Net income
 
$
27,261

 
$
22,367

 
$
16,311

 
$
20,798

Earnings per share - basic
 
$
0.20

 
$
0.16

 
$
0.12

 
$
0.15

Earnings per share - diluted
 
$
0.19

 
$
0.16

 
$
0.11

 
$
0.14

Cash and cash equivalents
 
$
278,627

 
$
263,052

 
$
269,995

 
$
259,733