Transition report pursuant to Rule 13a-10 or 15d-10

Composition of Certain Financial Statement Captions (Details)

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Composition of Certain Financial Statement Captions (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Jan. 31, 2013
Dec. 31, 2012
Jan. 31, 2012
Dec. 31, 2011
Jan. 31, 2011
Cash, Cash Equivalents and Investments            
Total cash and cash equivalents $ 245,755 $ 65,725 $ 59,939 $ 44,126 $ 44,126 $ 43,048
Total short-term investments 98,662 23,247        
Total long-term investments 105,686          
Cash, cash equivalents and investments 450,103 88,972        
Cash
            
Cash, Cash Equivalents and Investments            
Total cash and cash equivalents 89,176 22,703        
Money market funds
            
Cash, Cash Equivalents and Investments            
Total cash and cash equivalents 98,437 32,522        
Commercial paper
            
Cash, Cash Equivalents and Investments            
Total cash and cash equivalents 54,247 10,500        
Total short-term investments 47,526 13,592        
Corporate debt securities
            
Cash, Cash Equivalents and Investments            
Total cash and cash equivalents 3,895          
Total short-term investments 50,436 9,655        
Total long-term investments 100,690          
U.S. government and government agency debt securities
            
Cash, Cash Equivalents and Investments            
Total short-term investments 700          
Total long-term investments $ 4,996