CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS (Relationships with RRE Opportunity REIT, Atlas Energy, L.P. and 1845 Walnut Associates Ltd.) (Details) (USD $)			0 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jun. 17, 2011 RRE Opportunity REIT [Member]	Dec. 31, 2013 RRE Opportunity REIT [Member]	Dec. 31, 2013 Atlas Energy, L.P. [Member]	Oct. 31, 2012 1845 Walnut Associates Ltd. [Member] sqft	Dec. 31, 2013 1845 Walnut Associates Ltd. [Member]
Related Party Transaction [Line Items]
Receivables from managed entities and related parties, net	$ 30,923,000	$ 30,618,000		$ 787,000
Notes receivable, related party			1,400,000
Interest rate			6.50%
Notes receivable, related party, term			6 months
Due to related parties	3,110,000	3,536,000			22,000
Equity interest, ownership percentage							7.00%
Lease term							10 years
Area of real estate property						34,476
Payments for tenant improvements						$ 1,500,000
Potential extended additional term						5 years