Quarterly report pursuant to Section 13 or 15(d)

EQUITY AND EARNINGS PER SHARE - Narrative (Details)

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EQUITY AND EARNINGS PER SHARE - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 23, 2016
Jun. 27, 2016
Mar. 22, 2016
Dec. 10, 2015
Aug. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jan. 19, 2016
Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                      
Dividend declared per Share of Common Stock (in dollars per share) $ 0.46 $ 0.46 $ 0.46 $ 0.46   $ 0.46 $ 0.46 $ 1.38 $ 1.29    
Dividends $ 115,400,000 $ 106,000,000 $ 106,000,000 $ 106,000,000       $ 327,399,000      
Common stock repurchase amount authorized (up to)                   $ 200,000,000  
Stock issued during period, shares, new issues (in shares)         20,000,000.0            
Shares issued, price per share (in dollars per share)         $ 14.20            
Issuance of common stock         $ 278,775,000     278,775,000      
Issuance of common stock               $ 279,600,000 $ 882,166,000    
Options granted (in shares)               2,002,000      
Options exercised (in shares)               1,100,497      
Weighted average exercise price, exercised (in dollars per share)               $ 10.59      
Common stock, shares outstanding (in shares)           250,773,117   250,773,117     230,471,202
Share price (in dollars per share)           $ 13.81   $ 13.81      
Diluted common stock equivalent, shares outstanding, adjustment (in shares)           497,690 759,667 309,544 2,821,758    
Fortress [Member]                      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                      
Common stock, shares outstanding (in shares)           2,400,000   2,400,000      
Manager [Member]                      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                      
Stock issued during period, shares, new issues (in shares)         280,111            
Options granted (in shares)         2,000,000            
Options granted in period, fair value (in shares)         $ 2,300,000            
Options exercised (in shares)         1,100,497            
Weighted average exercise price, exercised (in dollars per share)         $ 10.59            
Employee Stock Option [Member] | Manager [Member]                      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                      
Risk free interest rate         1.45%            
Expected dividend rate         11.80%            
Expected volatility rate         27.57%            
Expected term (in years)         10 years