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REVENUE (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Deferred Revenue Disclosure | The table below summarizes our deferred revenue balances:
| Deferred Revenue (Current)1 |  | Deferred Revenue (Long-Term)
Opening balance as of January 1, 2018 | $ | 23.8 |  |  | $ | 51.4 |
Closing balance as of June 30, 2018 | 20.0 |  |  | 47.1 |
Decrease | $ | (3.8 | ) |  | $ | (4.3 | )
1 The opening balance includes a $1.4 million adjustment from the December 31, 2017 balance due to the adoption of Topic 606.

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- Definition The entire disclosure for deferred revenues at the end of the reporting period, and description and amounts of significant changes that occurred during the reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 430 -URI http://asc.fasb.org/topic&trid=2122452 + Details
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