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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Numerator:        
Net Income $ 7,969 $ 23,036 $ 12,116 $ 37,852
Denominator:        
Weighted-average shares, basic (in shares) 25,506,000 25,146,000 25,470,000 25,334,000
Dilutive effect of share-based payments (in shares) 142,000 139,000 142,000 156,000
Weighted-average shares, diluted (in shares) 25,648,000 25,285,000 25,612,000 25,490,000
Net income per common share, basic (in dollars per share) $ 0.31 $ 0.92 $ 0.48 $ 1.49
Net income per common share, diluted (in dollars per share) $ 0.31 $ 0.91 $ 0.47 $ 1.48
Weighted average shares excluded from the computation of diluted earnings per share (in shares) 405,159 568,955 432,846 517,845