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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Line Items]      
Foreign currency translation adjustments $ (4,186) $ (5,489) $ (5,691)
Pension liability, net of tax (13,673) (11,080) (12,776)
Total accumulated other comprehensive loss $ (17,859) $ (16,569) $ (18,467)