EQUITY AND EARNINGS PER SHARE - Options Assigned (Details)	Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	18,502,188
2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	1,708,708
2015 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices (in dollars per share) \| $ / shares	$ 15.25
2015 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices (in dollars per share) \| $ / shares	15.88
2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices (in dollars per share) \| $ / shares	$ 14.20
Stock options outstanding (in shares)	400,000
Options Assigned
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	2,108,708

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No definition available.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

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