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ORGANIZATION AND BASIS OF PRESENTATION - Summary of General Terms and Operating Partnership's Equity Interests (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2013
Fund II |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Payments of dividends |  |  | $ 47.1
Operating Partnership | Fund I and Mervyns I |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Operating Partnership Share of Capital | [1] | 22.22% |
Fund Size | [1] | $ 90.0 |
Capital Called | [1],[2] | 86.6 |
Unfunded Commitment | [1] | $ 0.0 |
Equity Interest Held By Operating Partnership | [1] | 37.78% |
Preferred Return | [1] | 9.00% |
Capital Returned | [1],[2] | $ 194.4 |
Operating Partnership | Fund II and Mervyns II |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Operating Partnership Share of Capital | [3] | 20.00% |
Fund Size | [3] | $ 300.0 |
Capital Called | [2],[3] | 300.0 |
Unfunded Commitment | [3] | $ 47.1 |
Equity Interest Held By Operating Partnership | [3] | 20.00% |
Preferred Return | [3] | 8.00% |
Capital Returned | [2],[3] | $ 131.6 |
Operating Partnership | Fund III |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Operating Partnership Share of Capital |  | 19.90% |
Fund Size | [3] | $ 502.5 |
Capital Called | [2] | 381.6 |
Unfunded Commitment |  | $ 68.4 |
Equity Interest Held By Operating Partnership |  | 19.90% |
Preferred Return |  | 6.00% |
Capital Returned | [2] | $ 429.1 |
Operating Partnership | Fund IV |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Operating Partnership Share of Capital |  | 23.12% |
Fund Size | [3] | $ 540.6 |
Capital Called | [2] | 179.4 |
Unfunded Commitment |  | $ 361.2 |
Equity Interest Held By Operating Partnership |  | 23.12% |
Preferred Return |  | 6.00% |
Capital Returned | [2] | $ 101.9 |
[1] | Fund I and Mervyns I have returned all capital and preferred return. The Operating Partnership is now entitled to a Promote on all future cash distributions.
[2] | Represents the total for the Funds, including the Operating Partnership and noncontrolling interests' shares.
[3] | During 2013, a distribution of $47.1 million was made to the Fund II investors, including the Operating Partnership. This amount is subject to recontribution to Fund II until December 2016, if needed to fund the on-going development and construction of existing projects.

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