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Summary of Significant Accounting Policies and New Accounting Standards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Summary of Significant Accounting Policies and New Accounting Standards        
Net income $ 12,161 $ 13,501 $ 37,264 $ 27,910
Weighted average number of shares - basic (in shares) 40,483 40,454 40,463 40,454
Dilutive effect of stock options and restricted stock units 21 50 41 50
Weighted average number of shares - diluted (in shares) 40,504 40,504 40,504 40,504
Net income per share        
basic (in dollars per share) $ 0.30 $ 0.33 $ 0.92 $ 0.69
diluted (in dollars per share) $ 0.30 $ 0.33 $ 0.92 $ 0.69