Quarterly report pursuant to Section 13 or 15(d)

Stock Repurchase Program (Details)

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Stock Repurchase Program (Details) (USD $)
3 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Jun. 30, 2011
Jul. 31, 1997
Feb. 28, 2011
February 2011 shares authorized
Stock Repurchase Program          
Authorized shares to be repurchased       72,800,000 10,000,000
Unpaid cost of stock repurchases $ 3,300,000   $ 2,700,000    
Shares available for repurchase 7,300,000        
Number of shares of common stock repurchased 1,763,000 1,972,000      
Total cost of repurchases $ 66,982,000 $ 59,323,000