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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 6 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Summary of Significant Accounting Policies and New Accounting Standards        
Net income $ 17,465 $ 12,801 $ 23,999 $ 25,103
Weighted average number of shares - basic (in shares) 40,504 40,454 40,504 40,454
Dilutive effect of restricted stock units   50   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) $ 0.43 $ 0.32 $ 0.59 $ 0.62
diluted (in dollars per share) $ 0.43 $ 0.32 $ 0.59 $ 0.62