EQUITY AND EARNINGS PER SHARE - Options Outstanding by Issuance (Details)	Sep. 30, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	18,502,188.000
Held by the Manager
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	16,128,730
Issued to the Manager and subsequently transferred to certain of the Manager’s employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	2,367,458
Issued to the independent directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	6,000
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	18,502,188