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STOCK-BASED COMPENSATION PLANS - Performance-Based Stock Units Activity (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Apr. 01, 2016	Mar. 16, 2015	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted average grant-date fair value
Total fair value of restricted stock awards, restricted stock units, performance-based stock awards and performance-based stock units on date vested				$ 8,312	$ 20,515	$ 10,376
PSUs
Change in unvested restricted stock awards
Unvested balance at the beginning of the period (in shares)				60,834
Granted (in shares)	131,250	131,250	195,000	207,350
Vested (in shares)				(57,768)
Forfeited (in shares)				0
Unvested balance at the end of the period (in shares)				210,416	60,834
Weighted average grant-date fair value
Unvested balance at the beginning of the period (in dollars per share)				$ 9.65
Granted (in dollars per share)				5.78
Vested (in dollars per share)				9.90
Forfeited (in dollars per share)				0.00
Unvested balance at end of the period (in dollars per share)				$ 5.77	$ 9.65
Total fair value of restricted stock awards, restricted stock units, performance-based stock awards and performance-based stock units on date vested				$ 600	$ 1,400	$ 200

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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

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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X

- 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).

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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).

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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.

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- Definition

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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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