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ALLOWANCE FOR CREDIT LOSSES: (Tables)
3 Months Ended
Jun. 30, 2020
Credit Loss [Abstract]  
Accounts Receivable, Allowance for Credit Loss
A summary of the activity of the allowance for doubtful accounts, returns and credits was (dollars in thousands):

For the three months ended:Balance at beginning of periodAdditions charged to costs and expensesOther changesBad debts written off, net of amounts recoveredBalance at end of period
June 30, 2020$7,575  $1,330  $(23) $(649) $8,233