STOCK OWNERSHIP AND BENEFIT PLANS - Schedule of Total Unrecognized Stock-Based Compensation (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock compensation	$ 3,493
Weighted-average recognition period (in years)	2 years 2 months 22 days
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock compensation	$ 1,281
Weighted-average recognition period (in years)	1 year 11 months 24 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock compensation	$ 428
Weighted-average recognition period (in years)	2 years 15 days

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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