Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Investments (Summary of Securities) (Details)

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Cash, Cash Equivalents and Investments (Summary of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents $ 148,884 $ 245,755 $ 437,082 $ 59,939
Total short-term investments 167,510 98,662    
Total long-term investments 120,944 105,686    
Cash, cash equivalents and investments 437,338 450,103    
Cash
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 51,004 89,176    
Money Market Funds
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 91,780 98,437    
Commercial Paper
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 6,100 54,247    
Total short-term investments 54,643 47,526    
Corporate Debt Securities
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 0 3,895    
Total short-term investments 112,867 50,436    
Total long-term investments 107,840 100,690    
US Government Agencies Debt Securities
        
Cash, Cash Equivalents and Investments        
Total short-term investments    700    
Total long-term investments $ 13,104 $ 4,996