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OTHER LONG-TERM LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
OTHER LONG-TERM LIABILITIES [Abstract]    
Accrued pension liabilities $ 34,919 $ 36,405
Accrued Income Taxes, Noncurrent 16,073 17,985
Accrued Employee Benefits 13,397 14,452
Deferred Revenue, Noncurrent 9,423 13,952
Other 6,349 5,530
Other Liabilities, Noncurrent $ 80,161 $ 88,324