Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Investments (Details 2)

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Cash, Cash Equivalents and Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
item
Dec. 31, 2013
Available-for-sale securities    
Adjusted Cost $ 385,907 $ 361,183
Unrealized Gains 28 6
Unrealized Losses (170) (262)
Fair Value 385,765 360,927
Adjusted Cost    
Due in one year or less 281,237 255,278
Due after one year through three years 104,670 105,905
Total 385,907 361,183
Fair Value    
Due in one year or less 281,196 255,241
Due after one year through three years 104,569 105,686
Total 385,765 360,927
Number of owned securities that were in an unrealized loss position 89  
Unrealized losses deemed to be other-than-temporary 0  
Available-for-sale securities that have been in an unrealized loss position for twelve months or more 0  
Money market funds
    
Available-for-sale securities    
Adjusted Cost 90,531 98,437
Fair Value 90,531 98,437
Commercial paper
    
Available-for-sale securities    
Adjusted Cost 82,424 101,773
Fair Value 82,424 101,773
Corporate debt securities
    
Available-for-sale securities    
Adjusted Cost 202,000 155,273
Unrealized Gains 28 6
Unrealized Losses (159) (258)
Fair Value 201,869 155,021
U.S. government and government agency debt securities
    
Available-for-sale securities    
Adjusted Cost 10,952 5,700
Unrealized Losses (11) (4)
Fair Value $ 10,941 $ 5,696