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INTANGIBLES AND OTHER ASSETS (Tables)
 12 Months Ended
Dec. 31, 2013
Intangibles and Other Assets [Abstract]  
Schedule of acquired finite-lived intangible assets by major class
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.