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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share [Abstract]    
Basic earnings per share, Net income $ 19,429 $ 34,986
Basic earnings per share (in dollars per share) $ 0.33 $ 0.61
Diluted earnings per share, Net income $ 19,429 $ 34,986
Diluted earnings per share (in dollars per share) $ 0.33 $ 0.60
Weighted-average number of shares outstanding - Basic (in shares) 58,424 57,412
Effect of dilutive securities (in shares) 495 1,187
Weighted-average number of shares outstanding - Diluted (in shares) 58,919 58,599
Excluded as anti-dilutive (in shares) 1,024 [1] 0 [1]
[1] Represents options to purchase Common Shares excluded from the calculation of diluted net income per share because the exercise price of the stock options was greater than or equal to the average price of the Common Shares during the period.