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INCOME TAXES (Reconciliation of Income Tax Uncertainties) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation Allowance [Line Items] |  |  |
Valuation allowance | $ 5,414 | $ 4,070 |
Reconciliation of the beginning and ending amount of income tax uncertainties |  |  |
Balance at the beginning of period | 6,356 | 7,934 | $ 6,408
Increases based on tax positions for the current year | 370 | 270 | 255
Increases based on tax positions of prior years | 1,562 | 1,283 | 2,684
Decreases based on tax positions of prior years | 0 | (1,472) | (518)
Settlements | (4,874) | (1,444) | (207)
Lapse of statute of limitations | (334) | (215) | (688)
Balance at the end of period | 3,080 | 6,356 | 7,934
Foreign taxes payable in the event of non-fulfillment of terms of government grants | 1,700 |  |
Amount of income tax uncertainties that, if recognized, would impact the effective tax rate | 3,100 |  |
Decrease in liability for uncertain tax positions, high end of range | 1,400 |  |
Unrecognized tax benefits, amount accrued for the payment of interest and penalties | 1,600 | 1,500 | 1,100
Unrecognized tax benefits, amount recognized in income tax expense | 100 | $ 400 | $ 400
Deferred tax assets related to tax credit carryforwards, U.S. state |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | 2,700 |  |
Deferred tax assets for specified locations |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | $ 2,700 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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