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Capitalized Data and Database Development Costs, Net (Tables)
 12 Months Ended
Dec. 31, 2011
Research and Development [Abstract]  
Schedule Of Capitalized Database Developement Costs
Database development costs for the years ended December 31, 2011 and 2010 are as follows:

(in thousands)
2011
 
2010
Capitalized data
$
373,333

 
$
261,074

Geospatial data
52,916

 
52,916

Eviction data
18,267

 
18,907

 
444,516

 
332,897

Less accumulated amortization
(140,510
)
 
(121,566
)
Capitalized data and database costs, net
$
304,006

 
$
211,331