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OTHER LONG-TERM LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]    
Accrued pension liabilities $ 35,062 $ 35,597
Deferred Revenue, Noncurrent 9,365 10,272
Income tax liabilities 8,943 11,399
Contingencies 6,500 6,500
Other 7,420 9,429
Other Liabilities, Noncurrent $ 67,290 $ 73,197