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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 1 (Details)
$ in Thousands
12 Months Ended
Aug. 14, 2017
USD ($)
Dec. 31, 2017
USD ($)
School
State
Campus
Segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Apr. 28, 2017
USD ($)
Business Activities [Abstract]          
Number of schools | School   23      
Number of states in which schools operate across the United States | State   14      
Number of campuses treated as destination schools | Campus   5      
Number of reportable segments | Segment   3      
Number of campuses operating under HOPS | Campus   18      
Number of campuses closed under HOPS | Campus   7      
Number of campuses remaining under HOPS | Campus   11      
Liquidity [Abstract]          
Gain on sale of property   $ 1,623 $ (233) $ (1,738)  
Cash and cash equivalents   54,500      
Restricted cash   40,000      
Revolving loan facility, available amount   4,400      
West Palm Beach Property [Member]          
Liquidity [Abstract]          
Cash purchase price $ 15,800 $ 8,000      
Gain on sale of property 1,500        
Short term loan         $ 8,000
Repayment of term loan $ 8,000