INCOME TAXES (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax [Line Items]
Tax benefit, re-measurement of net deferred tax liabilities, Tax Cuts and Jobs Act of 2017	$ 43,400,000		$ 43,400,000
Tax benefit, net operating loss carryback, Tax Cuts and Jobs Act of 2017			2,100,000
Income tax expense estimate, Tax Cuts and Jobs Act of 2017		$ 2,000,000	5,500,000
Income tax expense estimate, to be paid within one year, Tax Cuts and Jobs Act of 2017			400,000
Income tax benefit, Tax Cuts and Jobs Act of 2017		1,000,000
Final toll tax expense, Tax Cuts and Jobs Act of 2017			$ 4,500,000
Tax impact of repatriating foreign earnings		0
Increase in effective income tax rate during the period			462.80%
Effective income tax rate reconciliation, nondeductible executive compensation, amount		900,000
Effective income tax rate reconciliation, foreign income tax rate differential, increase (decrease), amount		$ 3,100,000	$ 1,200,000
Effective foreign income tax rate		11.60%	15.70%
Increase (decrease) in effective foreign income tax rate during period		(2.00%)	(2.90%)
Operating loss carryforwards, not subject to expiration		$ 33,600,000
Deferred tax assets, valuation allowance	7,961,000	6,973,000	$ 7,961,000	$ 3,600,000
Deferred tax assets, gross	96,499,000	104,950,000	96,499,000	78,200,000
Valuation allowance, period increase (decrease)		(1,000,000)	4,400,000
Unrecognized tax benefits that would impact effective tax rate		700,000
Amount of unrecorded benefit reasonably possible to be recognized (less than)		0
Penalties and interest expense		0	0	0
Penalties and interest accrued	$ 0	0	$ 0	$ 0
Federal
Income Tax [Line Items]
Operating loss carryforwards		118,400,000
Foreign Tax Authority
Income Tax [Line Items]
Operating loss carryforwards		34,500,000
Operating loss carryforwards, subject to expiration		$ 900,000
Foreign Tax Authority | Switzerland
Income Tax [Line Items]
Reduced corporate tax rate		8.00%
State and Local Jurisdiction
Income Tax [Line Items]
Operating loss carryforwards		$ 25,600,000