INVESTMENTS IN PARTNERSHIPS Significant Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Assets	$ 834,341	$ 763,870
Leigh Valley Associates, LP
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Equity Method Investment, Summarized Financial Information, Assets	$ 52,255	43,850		$ 49,264
Equity Method Investment, Summarized Financial Information, Mortgages Payable	196,328	199,451		$ 126,520
Equity Method Investment, Summarized Financial Information, Revenue	35,662	34,945	$ 36,923
Equity Method Investment, Summarized Financial Information, Property Operating Expenses	9,014	9,038	8,659
Equity Method Investment, Summarized Financial Information, Interest Expense	8,222	10,907	7,570
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	15,605	11,389	17,264
Equity Method Investment, Summarized Financial Information, Share of Equity in Income of Partnership	$ 7,803	$ 5,695	$ 8,632