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EMPLOYEE BENEFIT PLANS (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Deferred Compensation Arrangements [Abstract]    
Deferred Compensation Arrangement with Individual, Compensation Expense $ (24) $ 19
Deferred Compensation Arrangement with Individual, Recorded Liability 36 12
Contribution expense $ 823 $ 876
Defined Contribution 401K Safe Harbor Plan [Member]    
Deferred Compensation Arrangements [Abstract]    
Matching contribution of first 3% of eligible employees' contributions (as a percent) 100.00%  
Employer match of employee contributions as first eligible compensation (as a percent) 3.00%  
Matching contribution of first 2% of eligible employees' contributions (as a percent) 50.00%  
Employer match of employee contributions as next eligible compensation (as a percent) 2.00%  
Elective deferrals and basic matching contribution vested (as a percent) 100.00%  
Collective Bargaining Arrangement [Member]    
Deferred Compensation Arrangements [Abstract]    
Number of union locations where discretionary match continued | item 2  
Collective Bargaining Arrangement [Member] | Illinois    
Deferred Compensation Arrangements [Abstract]    
Matching contribution of first 4% of eligible employees' contributions (as a percent) 50.00%  
Percentage of eligible employees' contributions matched by the company 4.00%  
Collective Bargaining Arrangement [Member] | Pennsylvania    
Deferred Compensation Arrangements [Abstract]    
Matching contribution of first 3% of eligible employees' contributions (as a percent) 100.00%  
Employer match of employee contributions as first eligible compensation (as a percent) 3.00%  
Matching contribution of first 2% of eligible employees' contributions (as a percent) 50.00%  
Employer match of employee contributions as next eligible compensation (as a percent) 2.00%