ORGANIZATION AND BASIS OF PRESENTATION Summary of General Terms and Operating Partnership's Equity Interests (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Fund I and Mervyns I
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Operating Partnership Share of Capital	22.22%
Committed Capital	$ 90.0
Capital Called as of March 31, 2013	86.6
Ownership Interest By General Partner or Managing Partner	37.78%
Preferred Return	9.00%
Capital Returned as of March 31, 2013	86.6
Fund II and Mervyns II
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Operating Partnership Share of Capital	20.00%
Committed Capital	300.0
Capital Called as of March 31, 2013	300.0
Ownership Interest By General Partner or Managing Partner	20.00%
Preferred Return	8.00%
Capital Returned as of March 31, 2013	84.5
Fund III
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Operating Partnership Share of Capital	19.90%
Committed Capital	475.0
Capital Called as of March 31, 2013	357.7
Ownership Interest By General Partner or Managing Partner	19.90%
Preferred Return	6.00%
Capital Returned as of March 31, 2013	196.8
Fund IV
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Operating Partnership Share of Capital	23.12%
Committed Capital	540.6
Capital Called as of March 31, 2013	106.4
Ownership Interest By General Partner or Managing Partner	23.12%
Preferred Return	6.00%
Capital Returned as of March 31, 2013	$ 0