Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE - Outstanding Options (Details)

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EQUITY AND EARNINGS PER SHARE - Outstanding Options (Details) - shares
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options outstanding (in shares) 12,808,916  
Held by the Manager    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options outstanding (in shares) 10,511,167 6,961,222
Issued to the Manager and subsequently assigned to certain of the Manager’s employees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options outstanding (in shares) 2,290,749 1,530,916
Issued to the independent directors    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options outstanding (in shares) 7,000 6,000
Total    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options outstanding (in shares) 12,808,916 8,498,138