ACCOUNTING POLICIES - Schedule of VIEs (Details) - Variable Interest Entity - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
NHP/PMB L.P.
Variable Interest Entity
Total assets	$ 676,556	$ 673,467
Total liabilities	246,265	238,147
Other Identified VIEs
Variable Interest Entity
Total assets	2,145,884	2,075,499
Total liabilities	444,837	402,478
Tax Credit VIEs
Variable Interest Entity
Total assets	831,553	797,077
Total liabilities	$ 340,990	$ 298,154