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SUPPLEMENTARY CONSOLIDATED BALANCE SHEET INFORMATION (Schedule of Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SUPPLEMENTARY BALANCE SHEET INFORMATION [Abstract]      
Governmental authorities $ 8,388 $ 6,264  
Prepaid expenses 6,060 6,612  
Deferred charges 2,868 9,446  
Advance payments to suppliers 3,912 2,651  
Other 1,779 1,049  
Other current assets $ 23,007 $ 26,022 $ 19,415