INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jun. 14, 2017	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Effective income tax rate reconciliation, percent			11.30%	23.90%	(24.60%)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits, beginning of the period			$ 41,460	$ 25,382	$ 18,037
Increases in tax positions for prior years			3,655	252	1,153
Decreases in tax positions for prior years			0	0	(131)
Increases in tax positions for current year			8,090	8,131	7,908
Increases in tax positions acquired or assumed in a business combination			0	8,990	0
Decreases due to lapses of statutes of limitations			(8,051)	(1,295)	(1,585)
Gross unrecognized tax benefits, end of the period			45,154	41,460	25,382
Unrecognized tax benefits that would impact effective tax rate			24,600	23,400	18,900
Effective income tax rate reconciliation, change in enacted tax rate, amount		$ 200
Unrecognized tax benefits, income tax penalties and interest accrued			$ 2,900	$ 1,800	$ 1,200
Yokneam | Israel Tax Authority
Operating Loss Carryforwards [Line Items]
Effective income tax rate reconciliation, percent	7.50%
Tel Aviv | Israel Tax Authority
Operating Loss Carryforwards [Line Items]
Effective income tax rate reconciliation, percent	12.00%