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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Acquired Intangible Assets

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



(1) Balance as of January 1, 2013 has been revised to reflect purchase accounting measurement period adjustments (Note 6).

The Company tests goodwill for impairment at least annually. Through the date the consolidated financial statements were issued, no triggering events had occurred that would indicate a potential impairment exists.

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



Aggregate expense related to amortization of acquired intangible assets for the three and nine months ended September 30, 2013 was $4.9 million and $16.7 million, respectively. Aggregate expense related to amortization of acquired intangible assets for the three and nine months ended September 30, 2012 was $5.4 million and $15.6 million, respectively. Based on the Company’s acquired intangible assets as of September 30, 2013, aggregate expense related to amortization of acquired intangible assets is expected to be $4.9 million for the remainder of 2013, and $20.6 million, $18.8 million, $14.0 million and $9.5 million for 2014, 2015, 2016 and 2017, respectively.