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SHARE INCENTIVE PLAN - Nonvested Shares (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Oct. 24, 2018 USD ($) item $ / shares shares	Mar. 14, 2018 USD ($) item director $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
SHARE INCENTIVE PLAN
Share-based compensation recognized			$ 4,869	$ 3,990	$ 0
Non-vested shares
SHARE INCENTIVE PLAN
Shares granted | shares			218,000
Grant date fair value | $ / shares			$ 20.16
Share-based compensation recognized			$ 1,878	$ 0	$ 0
Directors and executive officers | Non-vested shares
SHARE INCENTIVE PLAN
Shares granted | shares		200,000
Number of directors and executive officers | director		3
Vesting of share-based compensation (as a percent)		25.00%
Shares vesting quarterly in twelve quarters (as a percent)		75.00%
Number of quarters of vesting | item		12
Grant date fair value | $ / shares		$ 20.43
Share-based compensation recognized		$ 4,086
Requisite service period		4 years
Non-employees | Non-vested shares
SHARE INCENTIVE PLAN
Shares granted | shares	18,000
Vesting of share-based compensation (as a percent)	25.00%
Shares vesting quarterly in twelve quarters (as a percent)	75.00%
Number of quarters of vesting | item	12
Grant date fair value | $ / shares	$ 17.11
Share-based compensation recognized	$ 308
Requisite service period	4 years

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Number of directors and executive officers for whom nonvested shares granted.

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Number of quarters in which the grants vest after the initial vesting in share based arrangement.

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Percentage of share-based compensation awards that vest quarterly over the next twelve quarters after the initial vesting.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

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-Name Accounting Standards Codification
-Topic 718
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-Section S99
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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
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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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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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Percentage of vesting of share-based compensation awards.

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