STOCK COMPENSATION PLAN - Restricted Stock Unit Activity (Details)	6 Months Ended
Jun. 30, 2019 $ / shares shares
Time-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	591,100
Granted (in shares)	442,200
Vested (in shares)	(200,200)
Forfeited/Canceled (in shares)	(66,000)
Outstanding, end of period (in shares)	767,100
Weighted Average Grant Date Fair Value Per Share
Granted (in dollars per share) \| $ / shares
Performance-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	591,100
Granted (in shares)	442,200
Vested (in shares)	0
Forfeited/Canceled (in shares)	(73,300)
Outstanding, end of period (in shares)	960,000
Weighted Average Grant Date Fair Value Per Share
Granted (in dollars per share) \| $ / shares
2019 \| Time-Based LTIP
Restricted Stock
Granted (in shares)	442,200
Vested (in shares)	0
Forfeited/Canceled (in shares)	0
Outstanding, end of period (in shares)	442,200
Weighted Average Grant Date Fair Value Per Share
Granted (in dollars per share) \| $ / shares	$ 22.55
Vested (in dollars per share) \| $ / shares	0.00
Forfeited/Canceled (in dollars per share) \| $ / shares	0.00
Outstanding, end of period (in dollars per share) \| $ / shares	$ 22.55
2019 \| Performance-Based LTIP
Restricted Stock
Granted (in shares)	442,200
Vested (in shares)	0
Forfeited/Canceled (in shares)	0
Outstanding, end of period (in shares)	442,200
Weighted Average Grant Date Fair Value Per Share
Granted (in dollars per share) \| $ / shares	$ 22.55
Vested (in dollars per share) \| $ / shares	0.00
Forfeited/Canceled (in dollars per share) \| $ / shares	0.00
Outstanding, end of period (in dollars per share) \| $ / shares	$ 22.55
2018 \| Time-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	434,700
Vested (in shares)	(132,800)
Forfeited/Canceled (in shares)	(40,800)
Outstanding, end of period (in shares)	261,100
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	19.06
Forfeited/Canceled (in dollars per share) \| $ / shares	19.70
Outstanding, end of period (in dollars per share) \| $ / shares	$ 19.05
2018 \| Performance-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	434,700
Vested (in shares)	0
Forfeited/Canceled (in shares)	(44,400)
Outstanding, end of period (in shares)	390,300
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	0.00
Forfeited/Canceled (in dollars per share) \| $ / shares	19.70
Outstanding, end of period (in dollars per share) \| $ / shares	$ 19.05
2017 \| Time-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	156,400
Vested (in shares)	(67,400)
Forfeited/Canceled (in shares)	(25,200)
Outstanding, end of period (in shares)	63,800
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
Vesting period	2 years
2017 \| Performance-Based LTIP
Restricted Stock
Outstanding, beginning of period (in shares)	156,400
Vested (in shares)	0
Forfeited/Canceled (in shares)	(28,900)
Outstanding, end of period (in shares)	127,500
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	0.00
Forfeited/Canceled (in dollars per share) \| $ / shares	19.70
Outstanding, end of period (in dollars per share) \| $ / shares	$ 19.70

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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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 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).

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