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Investments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Summary Of Short- and Long-term Investments    
Available-for-sale securities, Amortized Cost $ 184,952 $ 180,403
Available-for-sale securities, Gross Unrealized Gains 186 396
Available-for-sale securities, Gross Unrealized Losses (527) (49)
Available-for-sale securities, Estimated Fair Value 184,611 180,750
Corporate debt securities
   
Summary Of Short- and Long-term Investments    
Available-for-sale securities due in one year or less, Amortized Cost 54,636 52,332
Available-for-sale securities due in one to three years, Amortized Cost 73,115 59,176
Available-for-sale securities due in one year or less, Gross Unrealized Gains 76 88
Available-for-sale securities due in one to three years, Gross Unrealized Gains 35 137
Available-for-sale securities due in one year or less, Gross Unrealized Losses (12) (6)
Available-for-sale securities due in one to three years, Gross Unrealized Losses (431) (37)
Available-for-sale securities due in one year or less, Estimated Fair Value 54,700 52,414
Available-for-sale securities due in one to three years, Estimated Fair Value 72,719 59,276
U.S. treasury and government agency securities
   
Summary Of Short- and Long-term Investments    
Available-for-sale securities due in one year or less, Amortized Cost 24,683 24,795
Available-for-sale securities due in one to three years, Amortized Cost 30,018 34,606
Available-for-sale securities due in one year or less, Gross Unrealized Gains 32 86
Available-for-sale securities due in one to three years, Gross Unrealized Gains 42 84
Available-for-sale securities due in one year or less, Gross Unrealized Losses (2)  
Available-for-sale securities due in one to three years, Gross Unrealized Losses (82) (2)
Available-for-sale securities due in one year or less, Estimated Fair Value 24,713 24,881
Available-for-sale securities due in one to three years, Estimated Fair Value 29,978 34,688
Commercial paper
   
Summary Of Short- and Long-term Investments    
Available-for-sale securities due in one year or less, Amortized Cost 2,500 9,494
Available-for-sale securities due in one year or less, Gross Unrealized Gains 1 1
Available-for-sale securities due in one year or less, Gross Unrealized Losses   (4)
Available-for-sale securities due in one year or less, Estimated Fair Value $ 2,501 $ 9,491