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SIGNIFICANT ACCOUNTING POLICIES (Equity Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest in equity investments (as a percent) | 50.00% | 50.00%
Investments in Turkey and Chile |  |
Schedule of Equity Method Investments [Line Items] |  |
Amount of retained earnings that represents undistributed earnings of 50% or less owned equity investments | $ 19,670 | $ 19,333

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