STOCK COMPENSATION PLAN - Restricted Stock Unit Activity (Details)	3 Months Ended
Mar. 31, 2019 $ / shares shares
Time-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	591,100
Vested (in shares)	(193,200)
Forfeited/Canceled (in shares)	(55,500)
Outstanding, end of period (in shares)	342,400
Performance-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	591,100
Vested (in shares)	0
Forfeited/Canceled (in shares)	(58,000)
Outstanding, end of period (in shares)	533,100
2018 \| Time-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	434,700
Vested (in shares)	(128,900)
Forfeited/Canceled (in shares)	(33,800)
Outstanding, end of period (in shares)	272,000
Weighted Average Grant Date Fair Value Per Share
Outstanding, beginning of period (in dollars per share) \| $ / shares	$ 19.11
Vested (in dollars per share) \| $ / shares	19.04
Forfeited/Canceled (in dollars per share) \| $ / shares	19.70
Outstanding, end of period (in dollars per share) \| $ / shares	$ 19.08
2018 \| Performance-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	434,700
Vested (in shares)	0
Forfeited/Canceled (in shares)	(34,900)
Outstanding, end of period (in shares)	399,800
Weighted Average Grant Date Fair Value Per Share
Outstanding, beginning of period (in dollars per share) \| $ / shares	$ 19.11
Vested (in dollars per share) \| $ / shares	0
Forfeited/Canceled (in dollars per share) \| $ / shares	19.70
Outstanding, end of period (in dollars per share) \| $ / shares	$ 19.06
2017 \| Time-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	156,400
Vested (in shares)	(64,300)
Forfeited/Canceled (in shares)	(21,700)
Outstanding, end of period (in shares)	70,400
Weighted Average Grant Date Fair Value Per Share
Outstanding, beginning of period (in dollars per share) \| $ / shares	$ 19.70
Vested (in dollars per share) \| $ / shares	19.70
Forfeited/Canceled (in dollars per share) \| $ / shares	19.70
Outstanding, end of period (in dollars per share) \| $ / shares	$ 19.70
2017 \| Performance-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	156,400
Vested (in shares)	0
Forfeited/Canceled (in shares)	(23,100)
Outstanding, end of period (in shares)	133,300
Weighted Average Grant Date Fair Value Per Share
Outstanding, beginning of period (in dollars per share) \| $ / shares	$ 19.70
Vested (in dollars per share) \| $ / shares	0
Forfeited/Canceled (in dollars per share) \| $ / shares	19.70
Outstanding, end of period (in dollars per share) \| $ / shares	$ 19.70

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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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.

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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.

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

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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.

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

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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.

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