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OTHER LONG-TERM LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Liabilities, Noncurrent [Abstract]    
Accrued pension liabilities $ 35,597 $ 34,919
Income tax liabilities 11,399 16,073
Italian government grant 10,272 9,423
Contingencies 6,500 0
Accrued employment liabilities 4,178 15,689
Other 5,251 4,057
Other Liabilities, Noncurrent $ 73,197 $ 80,161