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INCOME TAXES (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax [Line Items]
Effective tax rate			(43.20%)	16.50%	(5.90%)
Income tax benefit, transfer intra-entity intellectual property, amount		$ 59,200,000
Effective worldwide tax rate			20.20%
Effective income tax rate reconciliation, foreign income tax rate differential, increase (decrease), amount			$ (48,200,000)	$ (5,700,000)
Effective foreign income tax rate			(57.10%)	3.50%	11.60%
Valuation allowance, period increase (decrease)			$ (100,000)	$ 2,900,000	$ (1,000,000.0)
Tax impact of repatriating foreign earnings			0
Unrecognized tax benefits that would impact effective tax rate	$ 700,000	700,000	700,000
Amount of unrecorded benefit reasonably possible to be recognized (less than)	0	0	0
Penalties and interest accrued	0	0	0	0	0
Penalties and interest expense			0	0	$ 0
Foreign Tax Authority
Income Tax [Line Items]
Operating loss carryforwards	36,700,000	36,700,000	36,700,000
Operating loss carryforwards, not subject to expiration	36,400,000	36,400,000	36,400,000
Foreign Tax Authority | Expire Through 2025
Income Tax [Line Items]
Operating loss carryforwards, subject to expiration	300,000	300,000	300,000
Foreign Tax Authority | Switzerland
Income Tax [Line Items]
Deferred income tax benefit, transfer intra-entity intellectual property, amount	59,200,000
Federal tax credit				$ 12,100,000
Federal tax credit (in dollars per share)				$ 0.14
Federal
Income Tax [Line Items]
Operating loss carryforwards	90,200,000	90,200,000	90,200,000
Operating loss carryforwards, not subject to expiration	11,800,000	11,800,000	11,800,000
State and Local Jurisdiction
Income Tax [Line Items]
Operating loss carryforwards	$ 41,600,000	$ 41,600,000	$ 41,600,000

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