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Commitments and Contingencies
6 Months Ended
Jun. 30, 2011
Commitments and Contingencies [Abstract]  
Commitments and Contingencies
7. Commitments and Contingencies
Leases
     In addition to equipment financed through capital leases, the Company is obligated under various noncancelable operating leases for office facilities and equipment. These leases generally provide for renewal options and rent escalation. Future minimum payments under non-cancellable lease agreements with initial terms of one year or more are as follows:
         
    (In  
    thousands)  
2011
  $ 3,367  
2012
    6,458  
2013
    5,601  
2014
    5,686  
2015
    5,767  
Thereafter
    16,632  
 
     
 
       
Total minimum lease payments
  $ 43,511  
 
     
     Total rent expense was $1.8 million and $3.3 million for the three and six months ended June 30, 2011, respectively, and $1.3 million and $2.6 million for the three and six months ended June 30, 2010, respectively.
Contingencies
     On March 16, 2011, the Company received notice that The Nielsen Company (US) LLC (“Nielsen”) filed a lawsuit against the Company in the United States District Court for the Eastern District of Virginia alleging, among other things, infringement of certain patent rights of Nielsen by the Company. Nielsen’s complaint seeks unspecified damages and injunctive relief. Based on an initial review of these claims against the Company, the Company believes that they are without merit. The Company continues to investigate the claims against the Company by Nielsen, as well as any defenses and additional potential counterclaims, and the Company intends to vigorously defend itself. It is not possible for the Company to estimate a potential range of loss at this time.
     On March 22, 2011, the Company filed a lawsuit against Nielsen and Netratings, LLC d/b/a Nielsen Online (“Netratings”) in the United States District Court for the Eastern District of Virginia alleging infringement of certain patent rights of the Company by Nielsen and Netratings. The Company’s complaint seeks unspecified damages and injunctive relief.
     From time to time, the Company is exposed to unasserted potential claims encountered in the normal course of business. Although the outcome of any legal proceeding cannot be predicted with certainty, management believes that the final resolution of these matters will not materially affect the Company’s consolidated financial position or results of operations.