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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The change in the carrying amount of goodwill for the nine months ended September 30, 2013 was as follows (in thousands):
Balance as of January 1, 2013 (1)
$
723,701

Divestiture of Advertising Decision Solutions business
(1,939
)
Acquisition of strategic network assets
29,509

Balance as of September 30, 2013
$
751,271
Schedule of Other Intangible Assets
Acquired intangible assets that are subject to amortization consist of the following as of September 30, 2013 and December 31, 2012 (in thousands):

 
September 30, 2013
 
Gross
Carrying
Amount
 
Accumulated Amortization
 
Net
Carrying
Amount
Completed technology
$
62,331

 
$
(33,071
)
 
$
29,260

Customer relationships
115,100

 
(73,536
)
 
41,564

Non-compete agreements
10,570

 
(4,084
)
 
6,486

Trademarks and trade names
3,400

 
(907
)
 
2,493

Acquired license rights
490

 
(490
)
 
—

Total
$
191,891

 
$
(112,088
)
 
$
79,803


 
December 31, 2012
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Completed technology
$
71,531

 
$
(32,842
)
 
$
38,689

Customer relationships
104,700

 
(68,702
)
 
35,998

Non-compete agreements
14,770

 
(7,645
)
 
7,125

Trademarks and trade names
3,700

 
(958
)
 
2,742

Acquired license rights
490

 
(490
)
 
—

Total
$
195,191

 
$
(110,637
)
 
$
84,554