Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE - Outstanding Options by Strike Price (Details)

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EQUITY AND EARNINGS PER SHARE - Outstanding Options by Strike Price (Details) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 3.72 $ 2.55
Total Unexercised Inception to Date (in shares) 8,436,931 5,010,576
Stock Option | Mar-11    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 1.00  
Stock Option | Sep-11    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) 1.00  
Stock Option | Apr-12    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) 1.00  
Stock Option | May-12    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) 1.00  
Stock Option | Jul-12    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) 1.00  
Stock Option | Jan-13    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) 2.32  
Stock Option | Feb-13    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) 2.95  
Stock Option | Jun-13    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) 3.23  
Stock Option | Nov-13    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) 3.57  
Stock Option | Aug-14    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 4.01  
Employees of Manager | Stock Option    
Option Indexed to Issuer's Equity [Line Items]    
Total Unexercised Inception to Date (in shares) 2,304,990  
Employees of Manager | Stock Option | Mar-11    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 1.00  
Total Unexercised Inception to Date (in shares) 124,740  
Employees of Manager | Stock Option | Sep-11    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 1.00  
Total Unexercised Inception to Date (in shares) 209,686  
Employees of Manager | Stock Option | Apr-12    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 1.00  
Total Unexercised Inception to Date (in shares) 139,340  
Employees of Manager | Stock Option | May-12    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 1.00  
Total Unexercised Inception to Date (in shares) 158,526  
Employees of Manager | Stock Option | Jul-12    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 1.00  
Total Unexercised Inception to Date (in shares) 175,196  
Employees of Manager | Stock Option | Jan-13    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 2.32  
Total Unexercised Inception to Date (in shares) 383,332  
Employees of Manager | Stock Option | Feb-13    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 2.95  
Total Unexercised Inception to Date (in shares) 153,332  
Employees of Manager | Stock Option | Jun-13    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 3.23  
Total Unexercised Inception to Date (in shares) 268,332  
Employees of Manager | Stock Option | Nov-13    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 3.57  
Total Unexercised Inception to Date (in shares) 386,340  
Employees of Manager | Stock Option | Aug-14    
Option Indexed to Issuer's Equity [Line Items]    
Strike Price (in dollars per share) $ 4.01  
Total Unexercised Inception to Date (in shares) 306,166