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NET INCOME PER SHARE - Narrative (Details) - shares shares in Millions | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Shares excluded from computation as their effect would be anti-dilutive (in shares) | 0.2 | 0.4
Restricted Units and Performance Units |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Weighted average number of shares outstanding, basic and diluted (in shares) | 0.5 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Period Type: | duration

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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 Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). + References No definition available. + Details
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- Details
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