TRADE PAYABLES (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	[1]	Dec. 31, 2017 CNY (¥)
TRADE PAYABLES [abstract]
Payables to third parties	¥ 826,717			¥ 614,822
Payables to related parties	614,117			710,255
Total trade payables	¥ 1,440,834	$ 209,561		¥ 1,325,077

[1] Translation of amounts from Renminbi (" RMB ") into United States dollars ("US$") for the convenience of the reader has been made at US$1.00=RMB6. 8755 , the certified exchange rates for December 31 , 201 8 as published by the Federal Reserve Board of the United States . No representation is made that the RMB amounts could have been, or could be, converted into US$ at that rate on December 31 , 201 8 or on any other date .