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SUBSEQUENT EVENTS (Restricted Stock and Performance Share Grants) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 13, 2016
Jan. 09, 2016
Jan. 28, 2015
Jan. 11, 2015
Jan. 12, 2014
Jan. 08, 2014
Jan. 13, 2013
Jan. 09, 2013
Dec. 31, 2015
Jan. 01, 2015
Dec. 26, 2013
Restricted Stock                      
Subsequent Event [Line Items]                      
Granted during the year (in shares)     228,116     227,447   297,866 228,116 227,447 297,866
Performance shares converted to shares of restricted common stock       306,696 330,750   273,719        
Restricted Stock | Minimum                      
Subsequent Event [Line Items]                      
Vesting period (in years)                 1 year    
Restricted Stock | Maximum                      
Subsequent Event [Line Items]                      
Vesting period (in years)                 4 years    
Restricted Stock | Officers and key employees | Class A common stock                      
Subsequent Event [Line Items]                      
Vesting period (in years)                 4 years    
Vesting rate (as a percent)                 25.00%    
Restricted Stock | Directors | Class A common stock                      
Subsequent Event [Line Items]                      
Vesting period (in years)                 1 year    
Vesting rate (as a percent)                 100.00%    
Subsequent Event | Restricted Stock | Officers, Directors and Key Employees                      
Subsequent Event [Line Items]                      
Granted during the year (in shares) 261,119                    
Subsequent Event | Restricted Stock | Officers, Directors and Key Employees | Class A common stock                      
Subsequent Event [Line Items]                      
Publicly traded common stock price (in dollars per share) $ 17.74                    
Subsequent Event | Restricted Stock | Officers, Directors and Key Employees | Minimum                      
Subsequent Event [Line Items]                      
Vesting period (in years) 1 year                    
Subsequent Event | Restricted Stock | Officers, Directors and Key Employees | Maximum                      
Subsequent Event [Line Items]                      
Vesting period (in years) 4 years                    
Subsequent Event | Restricted Stock | Officers and key employees                      
Subsequent Event [Line Items]                      
Vesting period (in years) 4 years                    
Vesting rate (as a percent) 25.00%                    
Subsequent Event | Restricted Stock | Directors                      
Subsequent Event [Line Items]                      
Vesting period (in years) 1 year                    
Vesting rate (as a percent) 100.00%                    
Subsequent Event | Performance Shares                      
Subsequent Event [Line Items]                      
Performance shares converted to shares of restricted common stock   262,476                  
Cash dividend paid (in dollars per share)   $ 3.6                  
Dividends paid   $ 0.9                  
Subsequent Event | Performance Shares | Officers and key employees                      
Subsequent Event [Line Items]                      
Granted during the year (in shares) 280,374                    
Percentage of target numbers of common stock, low end of the range 0.00%                    
Percentage of target numbers of common stock, high end of the range 150.00%                    
Subsequent Event | Performance Shares | Officers and key employees | Class A common stock                      
Subsequent Event [Line Items]                      
Publicly traded common stock price (in dollars per share) $ 17.74