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Capitalized Data and Database Development Costs, Net
 12 Months Ended
Dec. 31, 2012
Research and Development [Abstract]  
Capitalized Data and Database Developement Costs, Net
Capitalized Data and Database Development Costs, Net

Database development costs for the years ended December 31, 2012 and 2011 are as follows:

(in thousands)
2012
 
2011
Property data
$
417,565

 
$
373,333

Flood data
52,916

 
52,916

Eviction data
15,588

 
18,267

 
486,069

 
444,516

Less accumulated amortization
(163,780
)
 
(140,510
)
Capitalized data and database costs, net
$
322,289

 
$
304,006



Amortization expense relating to capitalized data and database development costs was approximately $27.3 million, $23.2 million and $17.7 million for the years ended December 31, 2012, 2011 and 2010 , respectively.