SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - INTANGIBLES (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Goodwill	$ 16,300	$ 16,300	$ 16,300	$ 16,300