INCOME TAXES - Provision for income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
U.S. federal	$ 4,009	$ 1,306	$ (617)
State and local	571	512	632
Foreign	3,609	4,648	(261)
Total current	8,189	6,466	(246)
Deferred:
U.S. federal	5,187	(17,487)	0
State and local	613	(12,283)	0
Foreign	4,845	1,257	(2,232)
Total deferred	10,645	(28,513)	(2,232)
Provision for (benefit from) taxes on income	$ 18,834	$ (22,047)	$ (2,478)