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EQUITY-BASED COMPENSATION - Performance-Based Restricted Stock Awards (Details) - Restricted Stock Awards - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 07, 2018 | Apr. 18, 2017 | Mar. 06, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Performance-Based |  |  |  |  |
Number of Shares |  |  |  |  |
Non-vested at the beginning of period (in shares) |  |  |  | 619,429 |
Granted (in shares) |  |  |  | 397,808 |
Vested (in shares) |  |  |  | (309,010) |
Non-vested at the end of period (in shares) |  |  |  | 708,227 |
Weighted Average Grant Date Fair Value |  |  |  |  |
Non-vested at the beginning of period (in dollars per share) |  |  |  | $ 16.16 |
Granted (in dollars per share) |  |  |  | 15.69 |
Vested (in dollars per share) |  |  |  | 18.78 |
Non-vested at the end of period (in dollars per share) |  |  |  | $ 14.75 |
Aggregate Current Value |  |  |  |  |
Non-vested outstanding |  |  |  | $ 10,135 | $ 9,434
Executive officers | Performance-Based |  |  |  |  |
Number of Shares |  |  |  |  |
Granted (in shares) | 243,303 | 30,322 | 180,039 |  |
Maximum | Executive officers |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares may earn, as multiple of shares granted |  |  |  | 200.00% |
Minimum | Executive officers |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares may earn, as multiple of shares granted |  |  |  | 0.00% |

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- Definition Represents the current value of equity-based compensation awards not vested. Excludes stock and unit options. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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