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LONG-TERM INCENTIVE COMPENSATION (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) executive shares | Sep. 30, 2016 USD ($) shares | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 9,729 | $ 5,669 |  |
Number of executives retired during period | executive | 2 |  |  |  |
Award vesting rights, percentage | 33.00% |  |  |  |
Trustee fee expense |  | 800 | 700 |  |
Fund III |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 3,600 |  |  |
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) | shares | 29,418 | 319,244 |  |  |
Total value of restricted shares and LTIP units as of the grant date | $ 1,100 |  |  |  |
Share-based compensation expense | $ 1,800 |  |  |  |
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) | 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) | shares |  | 11,092 |  |  |
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) | 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 |  | 1,800 |  | $ 1,900 |
Compensation expense not yet recognized | $ 8,200 | 8,200 |  |  |
Long term incentive and share based compensation expense |  | $ 9,100 | $ 5,200 |  |
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) | 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) | 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) | 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) | shares | 5,290 |  |  |  |

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