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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognitions (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017
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Revenue Recognition, Milestone Method [Line Items] |
Outdoor advertising contracts, term | 1 year

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- Definition Revenue Recognition, Advertising Contract Term + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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