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DERIVATIVE FINANCIAL INSTRUMENTS (Changes in fair value) (Details) - Cash flow hedges - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of analysis of other comprehensive income by item [line items] |  |
Other comprehensive income, before tax, cash flow hedges | $ 810 | $ 75
Accumulated other comprehensive income, tax | (22) | 170
Other comprehensive income, net of tax, cash flow hedges | 53 | (396)
Gains (losses) on cash flow hedges, before tax | 363 | (179)
Gains (losses) on cash flow hedges, tax | 3 | 54
Gains (losses) on cash flow hedges, net of tax | 366 | (125)
Reclassification adjustments on cash flow hedges, before tax | 372 | 820
Reclassification adjustments on exchange differences on translation, tax | (110) | (246)
Reclassification adjustments on cash flow hedges, net of tax | 262 | 574
Other comprehensive income, before tax, cash flow hedges | 75 | (566)
Accumulated other comprehensive income, tax | (129) | (22)
Other comprehensive income, net of tax, cash flow hedges | $ 681 | $ 53

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