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v3.3.1.900

SHARE INCENTIVE PLAN (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) installment $ / shares shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2013 USD ($) $ / shares | Dec. 31, 2012 USD ($) shares | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Trustee fees | $ | $ 300,000 |  |  |  |
2006 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Increase in number of shares authorized |  |  |  | 1,900,000 |
Number of shares authorized |  |  |  | 2,100,000 |
Employee Stock Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Option term |  |  |  | 10 years |
Options outstanding and vested to officers and employees (in shares) | 249 |  |  |  |
Employee Stock Option [Member] | Trustee [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options outstanding and vested to non-employee trustees (in shares) | 3,000 |  |  |  |
Award vesting period | 10 years |  |  |  |
Number of vesting anniversaries | installment | 3 |  |  |  |
LTIP Units [Member] | Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 247,863 |  |  |  |
LTIP Units [Member] | Trustee [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 10,601 |  |  |  |
LTIP Units [Member] | Trustee [Member] | Vesting on first anniversary |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 6,131 |  |  |  |
LTIP Units [Member] | Trustee [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 4,470 |  |  |  |
Restricted Stock [Member] | Trustee [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 14,179 |  |  |  |
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date | 6,469 |  |  |  |
Shares granted to trustees for trustee fees begin vesting on two year anniversary of grant date | 7,710 |  |  |  |
Annual vesting rate of shares granted to trustees that begin vesting on the second anniversary of grant date | 33.00% |  |  |  |
Restricted Stock [Member] | Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 8,640 |  |  |  |
LTIP Units and Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total value of restricted shares and LTIP units as of the grant date | $ |  |  |  | $ 8,600,000 |
Unit based compensation | $ | $ 6,800,000 |  |  |  |
Weighted average grant date fair value, grants (in dollars per share) | $ / shares | $ 33.90 | $ 26.30 | $ 26.40 |  |
LTIP Units and Restricted Stock [Member] | General and Administrative Expense [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unit based compensation | $ | $ 6,800,000 | $ 6,200,000 | $ 7,300,000 |  |
Long Term Investment Alignment Program [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense | $ | 700,000 |  |  |  |
Long Term Investment Alignment Program [Member] | Senior Executives [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total value of restricted shares and LTIP units as of the grant date | $ | $ 0 |  |  |  |
Max percentage of future fund III promote that may be awarded to senior executives |  |  |  |  | 25.00%
Percentage of promote awarded as share based compensation award |  |  |  |  | 20.00%

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