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STOCKHOLDERS' EQUITY: Qualified Employee Stock Purchase Plan (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Share-based compensation  
Future expense for performance stock option units $ 224,644
Employee Stock  
Share-based compensation  
Stock issued during period, ESPP (in shares) | shares 56,839
Shares issued, price per share (in dollars per share) | $ / shares $ 42.70
Stock issued during period, ESPP, value $ 2,400
Share-based compensation expense 500
Future expense for performance stock option units $ 700