Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Investments (Details)

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Cash, Cash Equivalents and Investments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents $ 160,796 $ 245,755 $ 52,236 $ 59,939
Total short-term investments 180,496 98,662    
Total long-term investments 104,569 105,686    
Cash, cash equivalents and investments 445,861 450,103    
Cash
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 60,096 89,176    
Money market funds
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 90,531 98,437    
Commercial paper
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 4,000 54,247    
Total short-term investments 78,424 47,526    
Corporate debt securities
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 6,169 3,895    
Total short-term investments 101,372 50,436    
Total long-term investments 94,328 100,690    
U.S. government and government agency debt securities
        
Cash, Cash Equivalents and Investments        
Total short-term investments 700 700    
Total long-term investments $ 10,241 $ 4,996