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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]    
Basic earnings per share, Net income $ 30,630 $ 19,429
Basic earnings per share (in dollars per share) $ 0.52 $ 0.33
Diluted earnings per share, Net income $ 30,630 $ 19,429
Diluted earnings per share (in dollars per share) $ 0.52 $ 0.33
Weighted-average number of shares outstanding - Basic (in shares) 59,063 58,424
Effect of dilutive securities (in shares) 315 495
Weighted-average number of shares outstanding - Diluted (in shares) 59,378 58,919
Excluded as anti-dilutive (in shares) 685 1,024