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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]        
Net Income $ 20,656 $ 16,821 $ 36,652 $ 36,029
Weighted-average shares outstanding, basic (in shares) 26,648,000 28,579,000 27,175,000 28,562,000
Dilutive effect of share-based payments (in shares) 254,000 252,000 252,000 251,000
Weighted-average shares outstanding, diluted (in shares) 26,902,000 28,831,000 27,427,000 28,813,000
Net income per common share, basic (in dollars per share) $ 0.78 $ 0.59 $ 1.35 $ 1.26
Net income per common share, diluted (in dollars per share) $ 0.77 $ 0.58 $ 1.34 $ 1.25
Weighted average shares excluded from the computation of diluted earnings per share (in shares) 488,087 319,508 457,087 273,549