STOCK AWARD PLANS - Additional Information (Details) - USD ($)	6 Months Ended
Jun. 30, 2018	May 12, 2016
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Maximum employee contribution to purchase company stock	$ 10,000
Discount rate used to determine the purchase price	15.00%
Stock Option
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Maximum shares that can be granted under stock plan (shares)		13,041,803
Shares available for stock awards (shares)	3,006,181
Stock award, vesting period	5 years
Unrecognized compensation expense	$ 45,900,000
Restricted Stock Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Stock award, vesting period	5 years
Unrecognized compensation expense	$ 106,900,000
Restricted Stock Awards \| Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Discount on outstanding grants	15.00%
Restricted Stock Awards \| Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Discount on outstanding grants	21.00%

Compensation Related Costs Share Based Payments Disclosure [Line Items]

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- Definition

Share based Compensation Arrangement by Share based Payment Award, Maximum Contribution Per Employee

+ References

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(v)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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