Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE EQUITY AND EARNINGS PER SHARE - Outstanding Options Narrative (Details)

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EQUITY AND EARNINGS PER SHARE EQUITY AND EARNINGS PER SHARE - Outstanding Options Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Aug. 31, 2014
Class of Stock [Line Items]        
Strike price adjustment for dividends (in dollars per share) $ 0.32      
Grant Date Strike Price (in dollars per share)   $ 2.79 $ 2.85  
Exercised (in shares)   266,657    
Issued Prior to 2011        
Class of Stock [Line Items]        
Grant Date Strike Price (in dollars per share)   $ 13.13    
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 | 2016        
Class of Stock [Line Items]        
Grant Date Strike Price (in dollars per share)   $ 3.01    
Intrinsic value of options exercised   $ 0.4    
Stock Option | Mar-11        
Class of Stock [Line Items]        
Grant Date Strike Price (in dollars per share)   $ 1.00    
Risk free rate (as percent)   1.70%    
Volatility (as percent)   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 (as percent)   1.13%    
Dividend yield (as percent)   13.20%    
Volatility (as percent)   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 (as percent)   1.30%    
Dividend yield (as percent)   12.90%    
Volatility (as percent)   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 (as percent)   1.05%    
Dividend yield (as percent)   11.90%    
Volatility (as percent)   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 (as percent)   0.75%    
Dividend yield (as percent)   11.90%    
Volatility (as percent)   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 (as percent)   2.00%    
Dividend yield (as percent)   8.80%    
Volatility (as percent)   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 (as percent)   2.10%    
Dividend yield (as percent)   7.80%    
Volatility (as percent)   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 (as percent)   2.50%    
Dividend yield (as percent)   8.80%    
Volatility (as percent)   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 (as percent)   2.80%    
Dividend yield (as percent)   6.70%    
Volatility (as percent)   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 (as percent)   2.70%    
Dividend yield (as percent)   8.60%    
Volatility (as percent)   23.40%    
Expected term   10 years    
Manager        
Class of Stock [Line Items]        
Grant Date Strike Price (in dollars per share)       $ 26.34
Manager | Stock Option | Prior to 2008        
Class of Stock [Line Items]        
Exercised (in shares)   111,770    
Management employees | Stock Option | Prior to 2008        
Class of Stock [Line Items]        
Exercised (in shares)   61,417    
Management employees | Stock Option | Oct-12        
Class of Stock [Line Items]        
Intrinsic value of options exercised   $ 0.2    
Management employees | Stock Option | Sep-13        
Class of Stock [Line Items]        
Intrinsic value of options exercised   $ 0.9    
Management employees | Stock Option | 2014        
Class of Stock [Line Items]        
Exercised (in shares)   215,853    
Intrinsic value of options exercised   $ 4.1    
Management employees | Stock Option | 2016        
Class of Stock [Line Items]        
Options forfeited (in shares)   16,748    
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