Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE EQUITY AND EARNINGS PER SHARE -Footnote Narrative (Details 5)

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EQUITY AND EARNINGS PER SHARE EQUITY AND EARNINGS PER SHARE -Footnote Narrative (Details 5) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Aug. 31, 2014
Nov. 30, 2013
Jun. 30, 2013
Feb. 28, 2013
Jan. 31, 2013
Class of Stock [Line Items]                
Strike price adjustment for dividends (in dollars per share) $ 0.32              
Grant Date Strike Price (in dollars per share)   $ 2.85 $ 4.26          
Exercised (in shares)   202,446            
Issued Prior to 2011                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 13.18            
Stock Option | Prior to 2008                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   14.09            
Stock Option | Oct-12                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   1.48            
Stock Option | Sep-13                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   1.67            
Stock Option | 2014                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   1.46            
Stock Option | 2015                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 1.00            
Intrinsic value of options exercised   $ 0.8            
Stock Option | Mar-11                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 1.00            
Risk free rate   1.70%            
Volatility   107.80%            
Expected term   3 years 3 months 19 days            
Stock Option | Sep-11                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 1.00            
Risk free rate   1.13%            
Dividend yield   13.20%            
Volatility   151.10%            
Expected term   4 years 7 months 6 days            
Stock Option | Apr-12                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 1.00            
Risk free rate   1.30%            
Dividend yield   12.90%            
Volatility   149.40%            
Expected term   4 years 8 months 12 days            
Stock Option | May-12                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 1.00            
Risk free rate   1.05%            
Dividend yield   11.90%            
Volatility   148.40%            
Expected term   4 years 9 months 18 days            
Stock Option | Jul-12                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 1.00            
Risk free rate   0.75%            
Dividend yield   11.90%            
Volatility   147.50%            
Expected term   4 years 9 months 18 days            
Stock Option | Jan-13                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 2.32            
Risk free rate   2.00%            
Dividend yield   8.80%            
Volatility   56.20%            
Expected term   10 years            
Stock Option | Feb-13                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 2.95            
Risk free rate   2.10%            
Dividend yield   7.80%            
Volatility   55.50%            
Expected term   10 years            
Stock Option | Jun-13                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 3.23            
Risk free rate   2.50%            
Dividend yield   8.80%            
Volatility   36.90%            
Expected term   10 years            
Stock Option | Nov-13                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 3.57            
Risk free rate   2.80%            
Dividend yield   6.70%            
Volatility   32.00%            
Expected term   10 years            
Stock Option | Aug-14                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)   $ 4.01            
Risk free rate   2.70%            
Dividend yield   8.60%            
Volatility   23.40%            
Expected term   10 years            
Manager                
Class of Stock [Line Items]                
Grant Date Strike Price (in dollars per share)       $ 26.34 $ 31.50 $ 29.82 $ 62.88 $ 56.10
Manager | Stock Option | Prior to 2008                
Class of Stock [Line Items]                
Exercised (in shares)   111,770            
Employees of Fortress | Stock Option | Prior to 2008                
Class of Stock [Line Items]                
Exercised (in shares)   61,417            
Employees of Fortress | Stock Option | Oct-12                
Class of Stock [Line Items]                
Intrinsic value of options exercised   $ 0.2            
Employees of Fortress | Stock Option | Sep-13                
Class of Stock [Line Items]                
Intrinsic value of options exercised   $ 0.9            
Employees of Fortress | Stock Option | 2014                
Class of Stock [Line Items]                
Exercised (in shares)   215,853            
Intrinsic value of options exercised   $ 4.1            
Directors | Stock Option | Prior to 2008                
Class of Stock [Line Items]                
Exercised (in shares)   666            
Directors | Stock Option | 2014                
Class of Stock [Line Items]                
Exercised (in shares)   333