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LONG-TERM INCENTIVE COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 4,150 | $ 3,746 |  |
Award vesting rights, percentage | 33.00% |  |  |  |
Trustee fee expense |  | 500 | 400 |  |
Fund III |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 2,500 |  |  |
Senior Executives | Long Term Investment Alignment Program |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum percentage of promote to be awarded as share based compensation awards |  |  |  |  | 25.00%
Senior Executives | Long Term Investment Alignment Program | Fund IV |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of promote awarded as share based compensation award |  |  |  |  | 9.30%
Senior Executives | Long Term Investment Alignment Program | Fund III |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of promote awarded as share based compensation award |  |  |  |  | 25.00%
LTIP Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) |  | 319,242 |  |  |
LTIP Units | Board of Trustees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment award, grants in period (in shares) | 13,491 |  |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) |  | 11,094 |  |  |
Restricted Stock | Board of Trustees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment award, grants in period (in shares) | 10,822 |  |  |  |
LTIP Units and Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total value of restricted shares and LTIP units as of the grant date |  | $ 10,100 |  |  |
Share-based compensation expense |  | 800 |  | $ 1,900 |
Compensation expense not yet recognized | $ 8,200 | 8,200 |  |  |
Long term incentive and share based compensation expense |  | $ 3,700 | $ 3,500 |  |
Tranche One | LTIP Units | Board of Trustees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation, vested in period (in shares) | 4,674 |  |  |  |
Tranche One | Restricted Stock | Board of Trustees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation, vested in period (in shares) | 5,532 |  |  |  |
Tranche Two | LTIP Units | Board of Trustees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation, vested in period (in shares) | 8,817 |  |  |  |
Tranche Two | Restricted Stock | Board of Trustees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation, vested in period (in shares) | 5,290 |  |  |  |

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- Definition Maximum Percentage of Promote To Be Awarded as Share Based Compensation Awards. Promote is defined as the amount above a certain performance measurement threshold. + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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