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
Sep. 30, 2012
Sep. 30, 2011
Investments in an Unrealized Loss Position    
Fair Value $ 182,314,000  
Gross Unrealized Losses, less than 12 months (195,000) [1]  
Continuous loss position not exceeding this period 12 months  
Net realized securities gains 300,000 700,000
U.S. Treasury securities
    
Investments in an Unrealized Loss Position    
Fair Value 2,038,000  
Gross Unrealized Losses, less than 12 months 0 [1]  
U.S. Government agency securities
    
Investments in an Unrealized Loss Position    
Fair Value 40,356,000  
Gross Unrealized Losses, less than 12 months (16,000) [1]  
Municipal securities
    
Investments in an Unrealized Loss Position    
Fair Value 16,472,000  
Gross Unrealized Losses, less than 12 months (17,000) [1]  
Corporate debt securities
    
Investments in an Unrealized Loss Position    
Fair Value 120,448,000  
Gross Unrealized Losses, less than 12 months (161,000) [1]  
Sovereign securities
    
Investments in an Unrealized Loss Position    
Fair Value 3,000,000  
Gross Unrealized Losses, less than 12 months $ (1,000) [1]  
[1] Of the total gross unrealized losses, there were no amounts that, as of September 30, 2012, had been in a continuous loss position for 12 months or more.