SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Real Estate (Details) (USD $)	1 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012 Companies	Dec. 31, 2011 Companies
Real Estate
Number of business combinations		23	11
Acquisition pursuit costs	$ 0	$ 3,200,000	$ 1,700,000
Impairment of Real Estate Investments	$ 0	$ 2,481,000	$ 0
Land improvements | Minimum
Real Estate
Property, plant and equipment, useful life		3 years
Land improvements | Maximum
Real Estate
Property, plant and equipment, useful life		40 years
Buildings and building improvements | Minimum
Real Estate
Property, plant and equipment, useful life		3 years
Buildings and building improvements | Maximum
Real Estate
Property, plant and equipment, useful life		40 years
Furniture and equipment | Minimum
Real Estate
Property, plant and equipment, useful life		1 year
Furniture and equipment | Maximum
Real Estate
Property, plant and equipment, useful life		20 years