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INTANGIBLES AND OTHER ASSETS
 12 Months Ended
Dec. 31, 2013
Intangibles and Other Assets [Abstract]  
INTANGIBLES AND OTHER ASSETS
INTANGIBLES AND OTHER ASSETS

Intangibles and other assets consist of the following (in thousands, except amortization period data):
 
 
December 31,
 
Weighted- Average
Amortization Period
(in years)
 
2012
 
2013
 
Capitalized product development cost
$
2,140

 
$
2,140

 
4
Accumulated amortization
(1,838
)
 
(2,029
)
 
 
Capitalized product development cost, net
302

 
111

 
 
 
 
 
 
 
 
Building photography
12,474

 
13,743

 
5
Accumulated amortization
(11,639
)
 
(12,005
)
 
 
Building photography, net
835

 
1,738

 
 
 
 
 
 
 
 
Acquired database technology
77,328

 
77,368

 
5
Accumulated amortization
(29,673
)
 
(41,073
)
 
 
Acquired database technology, net
47,655

 
36,295

 
 
 
 
 
 
 
 
Acquired customer base
130,683

 
130,960

 
10
Accumulated amortization
(59,218
)
 
(74,734
)
 
 
Acquired customer base, net
71,465

 
56,226

 
 
 
 
 
 
 
 
Acquired trade names and other (1)
59,255

 
59,336

 
7
Accumulated amortization
(8,880
)
 
(9,234
)
 
 
Acquired trade names and other, net
50,375

 
50,102

 
 
 
 
 
 
 
 
Intangibles and other assets, net
$
170,632

 
$
144,472

 
 

(1) The weighted-average amortization period for acquired trade names excludes $48.7 million for acquired trade names recorded in connection with the LoopNet acquisition on April 30, 2012, which amount is not amortized, but is subject to annual impairment tests.

Amortization expense for intangibles and other assets was approximately $4.4 million, $22.7 million and $27.6 million for the years ended December 31, 2011, 2012 and 2013, respectively.
 
In the aggregate, amortization for intangibles and other assets existing as of December 31, 2013 for future periods is expected to be approximately $23.5 million, $20.8 million, $18.9 million, $10.0 million and $5.1 million for the years ending December 31, 2014, 2015, 2016, 2017 and 2018, respectively.

During the fourth quarter of 2013, the Company completed the annual impairment test of the acquired trade name recorded in connection with the LoopNet acquisition and concluded that this indefinite-lived intangible asset was not impaired.