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
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents $ 157,848 $ 245,755 $ 40,113 $ 59,939
Total short-term investments 166,429 98,662    
Total long-term investments 113,647 105,686    
Cash, cash equivalents and investments 437,924 450,103    
Cash [Member]
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 51,648 89,176    
Money Market Funds [Member]
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 91,195 98,437    
Commercial Paper [Member]
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 7,749 54,247    
Total short-term investments 70,935 47,526    
Corporate Debt Securities [Member]
        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 7,256 3,895    
Total short-term investments 95,494 50,436    
Total long-term investments 103,793 100,690    
US Government Agencies Debt Securities [Member]
        
Cash, Cash Equivalents and Investments        
Total short-term investments   700    
Total long-term investments $ 9,854 $ 4,996