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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]        
Net Income $ 23,036 $ 20,656 $ 37,852 $ 36,652
Weighted-average shares, basic (in shares) 25,146,000 26,648,000 25,334,000 27,175,000
Dilutive effect of share-based payments (in shares) 139,000 254,000 156,000 252,000
Weighted-average shares, diluted (in shares) 25,285,000 26,902,000 25,490,000 27,427,000
Net income per common share, basic (in dollars per share) $ 0.92 $ 0.78 $ 1.49 $ 1.35
Net income per common share, diluted (in dollars per share) $ 0.91 $ 0.77 $ 1.48 $ 1.34
Weighted average shares excluded from the computation of diluted earnings per share (in shares) 568,955 488,087 517,845 457,087