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Intangible Assets
 6 Months Ended
Jun. 30, 2011
Intangible Assets [Abstract]  
Intangible Assets
12. Intangible Assets
          The following table sets forth our acquired intangible assets by major asset class as of June 30, 2011 and December 31, 2010 (in thousands except useful life data):
                                                         
    Useful     June 30, 2011     December 31, 2010  
    life             Accumulated     Net book             Accumulated     Net book  
    (years)     Gross     amortization     value     Gross     amortization     value  
Amortizing:
                                                       
Purchased technology
    1-3     $ 7,347     $ (6,303 )   $ 1,044     $ 7,347     $ (5,344 )   $ 2,003  
In process R&D
    2       990       (186 )     804       990       (62 )     928  
Capitalized software
    1-7       23,846       (16,897 )     6,949       23,846       (15,336 )     8,510  
Customer lists
    3-5       1,484       (1,417 )     67       1,484       (1,328 )     156  
Database
    10       182       (65 )     117       182       (56 )     126  
Trademarks
    5-10       926       (582 )     344       926       (537 )     389  
Trade names
    1-7       2,121       (1,407 )     714       2,121       (1,208 )     913  
Non-compete
    2       21       (17 )     4       21       (13 )     8  
Customer relationships
    4-7       11,130       (5,773 )     5,357       11,130       (4,704 )     6,426  
 
                                           
Totals
          $ 48,047     $ (32,647 )   $ 15,400     $ 48,047     $ (28,588 )   $ 19,459  
 
                                           
          Aggregate amortization expense on intangible assets was $2.0 million and $4.0 million for the three and six months ended June 30, 2011. Expected future amortization expense is as follows: $3.8 million for the remainder of 2011, $5.7 million for 2012, $4.8 million for 2013, $1.0 million for 2014, and $0.1 million thereafter.