FAIR VALUE - OTHER ASSETS AND OTHER LIABILITIES (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair value measurements
Other assets		$ 0	$ 0
Other liabilities		$ 0	$ 0
Level 3
Fair value measurements
Other assets	$ 0
Other liabilities	$ 0