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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Deferred Revenue Balances by Segments) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Significant Accounting Policies [Line Items]      
Deferred revenue balances ¥ 124,250 $ 18,071 ¥ 114,396
Career Enhancement [Member]      
Significant Accounting Policies [Line Items]      
Deferred revenue balances 24,333   21,496
K12 Schools [Member]      
Significant Accounting Policies [Line Items]      
Deferred revenue balances 87,027   77,394
Tutoring [Member]      
Significant Accounting Policies [Line Items]      
Deferred revenue balances ¥ 12,890   ¥ 15,506