RELATED PARTY TRANSACTIONS (Details) - Joint ventures related to affiliated real estate investments - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
RELATED PARTY TRANSACTIONS          
Management fees $ 0.9 $ 0.8 $ 2.7 $ 2.0  
Amounts due to the Company from related parties 7.8   7.8   $ 3.3
Mortgage loans receivable from consolidated joint ventures $ 25.6   $ 25.6   $ 34.7
HHFNE and HVP Ventures          
RELATED PARTY TRANSACTIONS          
Acquisition fee (as a percent)     0.50%    
Acquisition fees     $ 0.4 $ 1.8