REVENUE RECOGNITION - Allowance and deferred allowance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for credit loss
Beginning balance	$ (8,719)	$ (9,399)	$ (9,151)	$ (8,592)
Ending balance	(9,620)	(8,845)	(9,620)	(8,845)
Change in allowance	901	(554)	469	253
Deferred beginning balance	6,700	6,267	6,537	6,432
Deferred ending balance	6,954	6,284	6,954	6,284
Change in deferred allowance	(254)	(17)	(417)	148
Net amount charged to revenues	647	$ (571)	52	$ 401
Software subscriptions
Allowance for credit loss
Beginning balance			(9,151)
Ending balance	(9,620)		(9,620)
Deferred beginning balance			6,537
Deferred ending balance	$ 6,954		$ 6,954