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BASIS OF PRESENTATION, LIQUIDITY (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 79,749 | $ 83,922 | $ 77,050 | $ 77,824
Working capital | 78,500 |  |  |
Subsidiaries | China |  |  |  |
Cash and cash equivalents | 7,900 | $ 13,500 |  |
Accumulated profit determined in accordance with accounting standards of a particular country that can be paid as dividends | $ 0 |  |  |

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