INCOME TAXES - Effective rate reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at statutory rate	21.00%	21.00%	35.00%
Tax at rates other than the statutory rate	(15.60%)	(14.20%)	(4.80%)
Valuation allowance	0.00%	(29.10%)	47.30%
Net change in tax reserves	2.80%	4.10%	8.00%
Adjustment of deferred tax balances following changes in tax rates	0.00%	0.00%	(71.80%)
Other, net	0.20%	(1.40%)	(2.40%)
Provision for (benefit from) taxes on income	8.40%	(19.60%)	11.30%