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INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax [Line Items] |  |  |
Tax benefit, re-measurement of net deferred tax liabilities, Tax Cuts and Jobs Act of 2017 | $ 43,400 |  |
Income tax expense, Tax Cuts and Jobs Act of 2017 | 5,500 |  |
Income tax expense, to be paid within one year, Tax Cuts and Jobs Act of 2017 | $ 400 |  |
Decrease in effective income tax rate during the period | 486.20% |  |
Effective income tax rate reconciliation, foreign income tax rate differential, increase (decrease), amount | $ 1,200 | $ (800) |
Effective foreign income tax rate | 15.70% | 12.70% |
Increase (decrease) in effective foreign income tax rate during period | 2.90% | (2.10%) |
Operating loss carryforwards, not subject to expiration | $ 25,400 |  |
Deferred tax assets, valuation allowance | 7,961 | $ 3,604 | $ 4,900
Deferred tax assets, gross | 96,499 | 78,227 | 82,500
Valuation allowance, period increase | 4,400 | 1,300 |
Unrecognized tax benefits that would impact effective tax rate | 400 |  |
Amount of unrecorded benefit reasonably possible to be recognized | 100 |  |
Penalties and interest expense | 0 | 0 | 0
Penalties and interest accrued | 0 | $ 0 | $ 0
Federal |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 148,200 |  |
Foreign Tax Authority |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 26,400 |  |
Operating loss carryforwards, subject to expiration | $ 1,000 |  |
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 | $ 28,200 |  |

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