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Investments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Summary Of Short- and Long-term Investments    
Available-for-sale securities, Amortized Cost $ 182,970 $ 180,403
Available-for-sale securities, Gross Unrealized Gains 334 396
Available-for-sale securities, Gross Unrealized Losses (80) (49)
Available-for-sale securities, Estimated Fair Value 183,224 180,750
Corporate debt securities
   
Summary Of Short- and Long-term Investments    
Available-for-sale securities due in one year or less, Amortized Cost 56,956 52,332
Available-for-sale securities due in one to three years, Amortized Cost 67,624 59,176
Available-for-sale securities due in one year or less, Gross Unrealized Gains 105 88
Available-for-sale securities due in one to three years, Gross Unrealized Gains 103 137
Available-for-sale securities due in one year or less, Gross Unrealized Losses (7) (6)
Available-for-sale securities due in one to three years, Gross Unrealized Losses (71) (37)
Available-for-sale securities due in one year or less, Estimated Fair Value 57,054 52,414
Available-for-sale securities due in one to three years, Estimated Fair Value 67,656 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 22,635 24,795
Available-for-sale securities due in one to three years, Amortized Cost 31,757 34,606
Available-for-sale securities due in one year or less, Gross Unrealized Gains 54 86
Available-for-sale securities due in one to three years, Gross Unrealized Gains 72 84
Available-for-sale securities due in one to three years, Gross Unrealized Losses (1) (2)
Available-for-sale securities due in one year or less, Estimated Fair Value 22,689 24,881
Available-for-sale securities due in one to three years, Estimated Fair Value 31,828 34,688
Commercial paper
   
Summary Of Short- and Long-term Investments    
Available-for-sale securities due in one year or less, Amortized Cost 3,998 9,494
Available-for-sale securities due in one year or less, Gross Unrealized Gains   1
Available-for-sale securities due in one year or less, Gross Unrealized Losses (1) (4)
Available-for-sale securities due in one year or less, Estimated Fair Value $ 3,997 $ 9,491