SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 1,456	$ 1,478	$ 958	$ 1,339
Bad debt (recovery) expense	694	1,298	208
Increase (reduction) in allowance for doubtful accounts	$ (716)	$ (778)	$ (589)