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ALLOWANCE FOR CREDIT LOSSES: Summary of the activity of the allowance for doubtful accounts, returns and credits (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at beginning of period $ 7,575  
Provision for doubtful accounts 1,330 $ 962
Other changes (23)  
Bad debts written off, net of amounts recovered (649)  
Balance at end of period $ 8,233