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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Numerator:        
Net Income $ 10,649 $ 12,424 $ 22,765 $ 50,276
Denominator:        
Weighted-average shares, basic (in shares) 25,572,000 25,262,000 25,503,000 25,311,000
Dilutive effect of share-based payments (in shares) 34,000 138,000 104,000 147,000
Weighted-average shares, diluted (in shares) 25,606,000 25,400,000 25,607,000 25,458,000
Net income per common share, basic (in dollars per share) $ 0.42 $ 0.49 $ 0.89 $ 1.99
Net income per common share, diluted (in dollars per share) $ 0.42 $ 0.49 $ 0.89 $ 1.97
Weighted average shares excluded from the computation of diluted earnings per share (in shares) 952,351 442,001 534,082 454,006