FIXED ASSETS-NET - Narratives (Details) - CNY (¥)	Dec. 31, 2018	Dec. 31, 2017
FIXED ASSETS-NET [abstract]
Aggregate carrying value of ownership certificates of certain buildings that had not been obtained, net fixed assets	¥ 1,676,711,000	¥ 1,858,288,000
Carrying value of certificates for buildings under application procedures	1,067,076,000
Carrying value of certain buildings located on land use right certificates have not been obtained	53,392,000
Carrying value of certain buildings attached to pieces of land which is held by lease	556,243,000
Aggregate net book value of fixed assets that had been fully depreciated but they were still in use	¥ 138,390,000	¥ 155,125,000