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INCOME TAXES (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unrecognized tax benefits |  |  |
Outstanding balance for liabilities related to unrecognized tax benefits, which if recognized, would affect the effective tax rate | $ 4,600 | $ 6,800 |
Interest and penalties included in the outstanding balance for liabilities related to unrecognized tax benefits | 1,700 | 1,800 |
Increase (decrease) in interest and penalties | (200) | 100 |
Increase in liability for unrecognized tax benefits | 900 | 1,400 | $ 1,600
Interest expense and penalties included in increase in liability for unrecognized tax benefits | 100 | 300 | 300
Benefit related to the lapse of applicable statute of limitations | 2,300 | 2,500 | 100
Reconciliation of the beginning and ending amount of liabilities associated with uncertain tax benefits, excluding interest and penalties |  |  |
Unrecognized tax benefits, opening balance | 4,908 | 5,825 | 4,950
Settlement of liability reclassified as income tax payable | 0 | 0 | (104)
Payments on liability | 0 | 0 | 0
Tax positions taken in a prior period |  |  |
Gross increases | 0 | 0 | 0
Gross decreases | (705) | 0 | (47)
Tax positions taken in the current period |  |  |
Gross increases | 716 | 1,182 | 1,252
Gross decreases | 0 | 0 | 0
Lapse of applicable statute of limitations | (1,970) | (2,121) | (69)
Currency translation adjustments, increase | 7 | 22 |
Currency translation adjustments, decrease |  |  | (157)
Unrecognized tax benefits, ending balance | $ 2,956 | $ 4,908 | $ 5,825

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