STOCK COMPENSATION PLAN - Stock Option, and Restricted Stock and Restricted Stock Unit Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Weighted Average Grant Date Fair Value Per Share
Shares withheld for withholding taxes (in shares)		89,620
Restricted Stock and Restricted Stock Units
Restricted Stock
Outstanding, beginning of period (in shares)	795,000	411,000
Granted (in shares)	1,303,900	853,100
Vested (in shares)	(388,700)	(216,000)
Forfeited (in shares)	(303,500)	(253,100)
Outstanding, end of period (in shares)	1,406,700	795,000
Weighted Average Grant Date Fair Value Per Share
Outstanding, beginning of period (in dollars per share)	$ 29.87	$ 30.78
Granted (in dollars per share)	19.39	30.94
Vested (in dollars per share)	33.04	32.63
Forfeited (in dollars per share)	25.08	32.60
Outstanding, end of period (in dollars per share)	$ 20.32	$ 29.87
Shares withheld for withholding taxes (in shares)		89,620
Restricted Stock
Weighted Average Grant Date Fair Value Per Share
Shares withheld for withholding taxes (in shares)	167,297	89,620
Stock Plan \| Restricted Stock
Restricted Stock
Granted (in shares)	69,767
LTP Program \| Restricted Stock
Restricted Stock
Granted (in shares)		853,111
LTP Program \| Restricted Stock Units
Restricted Stock
Granted (in shares)	1,234,116
Forfeited (in shares)	(52,022)

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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 (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ 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 (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 718
-SubTopic 10
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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