ACCOUNTING POLICIES - Schedule of VIEs (Details) - Variable Interest Entity - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
NHP/PMB L.P.
Variable Interest Entity
Total assets	$ 673,490	$ 673,467
Total liabilities	246,482	238,147
Other Identified VIEs
Variable Interest Entity
Total assets	4,017,793	2,076,715
Total liabilities	1,424,350	405,350
Tax Credit VIEs
Variable Interest Entity
Total assets	839,743	797,077
Total liabilities	$ 335,341	$ 297,004