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SHARE INCENTIVE PLAN - Nonvested Shares (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
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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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- Definition Number of quarters in which the grants vest after the initial vesting in share based arrangement. + References No definition available. + Details
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- Definition Percentage of share-based compensation awards that vest quarterly over the next twelve quarters after the initial vesting. + References No definition available. + Details
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- Definition 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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