Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE - Shares Issued in Public Offering (Details)

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EQUITY AND EARNINGS PER SHARE - Shares Issued in Public Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]        
Net proceeds   $ 0 $ 0 $ 198,702
Options, Grant Date Strike Price (in dollars per share)   $ 2.79 $ 2.85  
Principals of Fortress        
Class of Stock [Line Items]        
Number of Shares Issued (in shares) 83,333      
Price per Share (in dollars per share) $ 26.34      
Manager        
Class of Stock [Line Items]        
Options, Number of Shares (in shares) 765,416      
Options, Grant Date Strike Price (in dollars per share) $ 26.34      
Options, Grant Date Value $ 1,700      
Underwriter        
Class of Stock [Line Items]        
Number of Shares Issued (in shares) 7,654,166      
Price per Share (in dollars per share) $ 25.92      
Net proceeds $ 197,900