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EQUITY-BASED COMPENSATION - Time-Based Restricted Stock Awards (Details) - Restricted Stock Awards - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 24, 2016 | Mar. 08, 2016 | Mar. 03, 2016 | Feb. 24, 2016 | Mar. 03, 2015 | Jun. 30, 2016 | Dec. 31, 2015
Time-Based |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Non-vested at the beginning of period (in shares) |  |  |  |  |  | 250,011 |
Granted (in shares) |  |  |  |  |  | 191,717 |
Vested (in shares) |  |  |  |  |  | (82,869) |
Forfeited (in shares) |  |  |  |  |  | (406) |
Non-vested at the end of period (in shares) |  |  |  |  |  | 358,453 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Non-vested at the beginning of period (in dollars per share) |  |  |  |  |  | $ 12.03 |
Granted (in dollars per share) |  |  |  |  |  | 11.35 |
Vested (in dollars per share) |  |  |  |  |  | 11.06 |
Forfeited, (in dollars per share) |  |  |  |  |  | 10.27 |
Non-vested at the end of period (in dollars per share) |  |  |  |  |  | $ 11.89 |
Aggregate Current Value |  |  |  |  |  |  |
Non-vested outstanding |  |  |  |  |  | $ 4,746 | $ 2,988
Performance-Based |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Non-vested at the beginning of period (in shares) |  |  |  |  |  | 308,367 |
Granted (in shares) |  |  |  |  |  | 254,563 |
Vested (in shares) |  |  |  |  |  | (113,903) |
Non-vested at the end of period (in shares) |  |  |  |  |  | 449,027 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Non-vested at the beginning of period (in dollars per share) |  |  |  |  |  | $ 12.95 |
Granted (in dollars per share) |  |  |  |  |  | 13.77 |
Vested (in dollars per share) |  |  |  |  |  | 7.10 |
Non-vested at the end of period (in dollars per share) |  |  |  |  |  | $ 14.90 |
Aggregate Current Value |  |  |  |  |  |  |
Non-vested outstanding |  |  |  |  |  | $ 5,945 | $ 3,685
Employees | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 22,010 |  |  |
Employees | Period one | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting percentage |  |  |  | 20.00% |  |  |
Employees | Period two | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting percentage |  |  |  | 20.00% |  |  |
Employees | Period three | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting percentage |  |  |  | 20.00% |  |  |
Employees | Period four | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting percentage |  |  |  | 40.00% |  |  |
Executive officers and management | Time-Based |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 149,410 |  |
Executive officers and management | Cliff vest | Time-Based |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 37,230 |  |
Executive officers and management | Period one | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |
Executive officers and management | Period two | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 25.00% |  |
Executive officers and management | Period three | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 50.00% |  |
Executive officers | Time-Based |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) | 16,930 | 169,707 |  |  |  |  |
Executive officers | Performance-Based |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) |  | 254,563 | 154,505 |  |  |  |
Executive officers | Period one | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |  |
Executive officers | Period two | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |  |
Executive officers | Period three | Time-Based |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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://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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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