BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Real Estate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments in Real Estate
Impairment of long-lived assets	$ 0	$ 13,100	$ 0	$ 13,100
Buildings and improvements | Minimum
Investments in Real Estate
Estimated useful lives			15 years
Buildings and improvements | Maximum
Investments in Real Estate
Estimated useful lives			40 years
Furniture, fixtures, and equipment | Minimum
Investments in Real Estate
Estimated useful lives			3 years
Furniture, fixtures, and equipment | Maximum
Investments in Real Estate
Estimated useful lives			5 years