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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2013
Goodwill and Other Intangible Assets [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill were as follows (in thousands):
Balance as of January 1, 2013
$
731,325

Divestiture of Advertising Decision Solutions business
(1,939
)
Balance as of June 30, 2013
$
729,386
Schedule of Other Intangible Assets
Acquired intangible assets that are subject to amortization consist of the following (in thousands, except for years):

 
June 30, 2013
 
 
 
Gross
Carrying
Amount
 
Accumulated Amortization
 
Net
Carrying
Amount
 
Weighted Average Amortization Period in Years
Completed technology
$
62,331

 
$
(30,666
)
 
$
31,665

 
6
Customer relationships
100,400

 
(71,533
)
 
28,867

 
9
Non-compete agreements
9,170

 
(3,716
)
 
5,454

 
4
Trademarks and trade names
3,400

 
(824
)
 
2,576

 
9
Acquired license rights
490

 
(490
)
 
—

 
10
Total
$
175,791

 
$
(107,229
)
 
$
68,562

 
 

 
December 31, 2012
 
 
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Weighted Average Amortization Period in Years
Completed technology
$
71,531

 
$
(32,842
)
 
$
38,689

 
6
Customer relationships
104,700

 
(68,702
)
 
35,998

 
9
Non-compete agreements
14,770

 
(7,645
)
 
7,125

 
5
Trademarks and trade names
3,700

 
(958
)
 
2,742

 
9
Acquired license rights
490

 
(490
)
 
—

 
10
Total
$
195,191

 
$
(110,637
)
 
$
84,554