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Capitalized Data and Database Development Costs, Net
 12 Months Ended
Dec. 31, 2013
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, 2013 and 2012 are as follows:

(in thousands)
2013
 
2012
Property data
$
446,941

 
$
417,516

Flood data
55,416

 
52,916

Eviction data
16,560

 
15,587

 
518,917

 
486,019

Less accumulated amortization
(188,729
)
 
(163,730
)
Capitalized data and database costs, net
$
330,188

 
$
322,289



Amortization expense relating to capitalized data and database development costs was approximately $30.1 million, $27.3 million and $23.2 million for the years ended December 31, 2013, 2012 and 2011, respectively.