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OTHER LONG-TERM LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other Liabilities, Noncurrent [Abstract]    
Accrued pension liabilities $ 31,080 $ 35,062
Operating Lease, Liability, Noncurrent 17,360 0
Deferred Revenue, Noncurrent 8,227 9,365
Contingencies 6,500 6,500
Income tax liabilities 4,503 8,943
Other 5,475 7,420
Other Liabilities, Noncurrent $ 73,145 $ 67,290