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21. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Accumulated Other Comprehensive Income Loss Details |  |
Cumulative foreign currency translation | $ (48,454) | $ (61,371)
Gross unamortized experience gain – post employment liability | 786 | 786
Tax effect unamortized experience gain – post employment liability | (208) | (208)
Gross unrealized gains on investments | 11 | 7
Accumulated other comprehensive loss | $ (47,865) | $ (60,786)

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