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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Concentration of Credit Risk Cash balances were as follows (in thousands):
December 31, 2019December 31, 2018
Cash in U.S. dollars in U.S. banks$80,736  $69,155  
Cash in foreign banks and foreign currency5,372  3,865  
Petty cash9  9  
$86,117  $73,029