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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES, Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue Recognition [Abstract] |  |  |
Revenues recognized on contracts in process | $ 40.6 | $ 31.5 | $ 47.5
Minimum [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Service revenue contract term | 1 year |  |
Maximum [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Service revenue contract term | 2 years |  |

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- Definition Term of the service revenue contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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- References No definition available. + Details
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- Details
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