Annual report pursuant to Section 13 and 15(d)

LOANS PAYABLE AND OTHER BORROWINGS - Schedule of Loans Payable and Other Borrowings (Descriptors) (Details)

v3.8.0.1
LOANS PAYABLE AND OTHER BORROWINGS - Schedule of Loans Payable and Other Borrowings (Descriptors) (Details) - Line of credit [Member] - Revolving credit facility [Member]
 12 Months Ended
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]  
Unsecured revolving credit facility maturing July 2019 $ 625,000,000
London Interbank Offered Rate (LIBOR) [Member]  
Line of Credit Facility [Line Items]  
Base rate 1.56%
Basis spread on variable rate 1.75%
Prime Rate [Member]  
Line of Credit Facility [Line Items]  
Base rate 4.50%
Basis spread on variable rate 0.75%