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ALLOWANCE FOR CREDIT LOSSES: Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Credit Loss [Abstract]      
Allowances for credit losses, returns and credits $ 8,200   $ 7,600
Provision for doubtful accounts $ 1,330 $ 962