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OTHER LONG-TERM LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Other Liabilities, Noncurrent [Abstract]    
Accrued pension liabilities $ 24,326 $ 31,080
Operating Lease, Liability, Noncurrent 17,137 17,360
Foreign government grant (1) 10,279 8,227
Contingencies 2,694 6,500
Income tax liabilities 804 4,503
Other 8,189 10,355
Other Liabilities, Noncurrent $ 63,429 $ 78,025