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ALLOWANCE FOR DOUBTFUL ACCOUNTS (Changes in Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Allowance for Doubtful Accounts    
Allowance for doubtful accounts, beginning balance $ 12,670 $ 14,417
Reserve accruals 4,158 5,030
Uncollectable accounts written-off (4,937) (6,743)
Foreign currency translation (21) (34)
Allowance for doubtful accounts, ending balance $ 11,870 $ 12,670