Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Continuous Unrealized Loss Position) (Details)

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Marketable Securities (Continuous Unrealized Loss Position) (Details) (USD $)
 3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Investments in an Unrealized Loss Position        
Fair Value $ 274,107,000   $ 274,107,000  
Gross Unrealized Losses, less than 12 months (436,000) [1]   (436,000) [1]  
Continuous loss position not exceeding this period 12 months      
Net realized securities gains (losses) 1,000,000 (100,000) 1,400,000 600,000
U.S. Treasury securities
        
Investments in an Unrealized Loss Position        
Fair Value 4,999,000   4,999,000  
Gross Unrealized Losses, less than 12 months (3,000) [1]   (3,000) [1]  
U.S. Government agency securities
        
Investments in an Unrealized Loss Position        
Fair Value 37,083,000   37,083,000  
Gross Unrealized Losses, less than 12 months (6,000) [1]   (6,000) [1]  
Municipal securities
        
Investments in an Unrealized Loss Position        
Fair Value 30,399,000   30,399,000  
Gross Unrealized Losses, less than 12 months (88,000) [1]   (88,000) [1]  
Corporate debt securities
        
Investments in an Unrealized Loss Position        
Fair Value 200,660,000   200,660,000  
Gross Unrealized Losses, less than 12 months (336,000) [1]   (336,000) [1]  
Sovereign securities
        
Investments in an Unrealized Loss Position        
Fair Value 966,000   966,000  
Gross Unrealized Losses, less than 12 months $ (3,000) [1]   $ (3,000) [1]  
[1] Of the total gross unrealized losses, there were no amounts that, as of December 31, 2012, had been in a continuous loss position for 12 months or more.