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INTANGIBLES AND OTHER ASSETS (Details) (USD $) In Thousands, unless otherwise specified |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  | 0 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Capitalized Product Development Costs [Member] | Dec. 31, 2012 Capitalized Product Development Costs [Member] | Sep. 30, 2013 Building Photography [Member] | Dec. 31, 2012 Building Photography [Member] | Sep. 30, 2013 Acquired Database Technology [Member] | Dec. 31, 2012 Acquired Database Technology [Member] | Sep. 30, 2013 Acquired Customer Base [Member] | Dec. 31, 2012 Acquired Customer Base [Member] | Sep. 30, 2013 Acquired Trade Names and Other [Member] | Dec. 31, 2012 Acquired Trade Names and Other [Member] | Apr. 30, 2012 LoopNet [Member] | Apr. 30, 2012 LoopNet [Member] Acquired Database Technology [Member] | Apr. 30, 2012 LoopNet [Member] Acquired Customer Base [Member]
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, Intangible assets not amortizable |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,700 |  |
Finite-lived intangible assets, gross |  |  | 2,140 | 2,140 | 13,566 | 12,474 | 77,325 | 77,328 | 130,662 | 130,683 | 59,249 | 59,255 |  |  |
Finite-lived intangible assets, accumulated amortization |  |  | (1,981) | (1,838) | (11,830) | (11,639) | (38,284) | (29,673) | (70,968) | (59,218) | (9,079) | (8,880) |  |  |
Finite-lived intangible assets, net | $ 150,800 | $ 170,632 | $ 159 | $ 302 | $ 1,736 | $ 835 | $ 39,041 | $ 47,655 | $ 59,694 | $ 71,465 | $ 50,170 | $ 50,375 |  |  |
Weighted-average amortization period (in years} |  |  | 4 years |  | 5 years |  | 5 years |  | 10 years |  | 7 years |  |  | 5 years | 10 years

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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