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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 |  |

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