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 127 Months Ended
Aug. 31, 2014
Nov. 30, 2013
Jun. 30, 2013
Feb. 28, 2013
Jan. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Class of Stock [Line Items]                  
Number of Shares Issued         9,583,333 230,090 7,848,926 29,821,308 28,754,274
Price per Share         $ 56.10   $ 25.92    
Proceeds from Issuance of Common Stock         $ 526,200 $ 0 $ 198,702 $ 1,264,769  
Grant Date Strike Price (in dollars per share           $ 2.85 $ 4.26    
Manager                  
Class of Stock [Line Items]                  
Number of Shares 765,416 965,849 670,833 383,333 958,333        
Grant Date Strike Price (in dollars per share $ 26.34 $ 31.50 $ 29.82 $ 62.88 $ 56.10        
Grant date value $ 1,700 $ 6,000 $ 3,800 $ 8,400 $ 18,000        
Principals of Fortress                  
Class of Stock [Line Items]                  
Number of Shares Issued 83,333 75,159 125,000 31,833 35,650        
Price per Share $ 26.34 $ 31.50 $ 29.82 $ 62.88 $ 56.10        
Underwriter                  
Class of Stock [Line Items]                  
Number of Shares Issued 7,654,166 9,658,492 6,708,333 3,833,333          
Price per Share $ 25.92 $ 31.26 $ 29.52 $ 62.04          
Proceeds from Issuance of Common Stock $ 197,900 $ 301,400 $ 197,600 $ 237,400