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Short-Term And Long-Term Investments (Schedule Of Short-Term And Long-Term Investments By Contractual Maturity) (Details) (USD $)
In Thousands
9 Months Ended12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Short-term Debt [Line Items]  
Contractual Maturity For the Year, 2011$ 29,471$ 185,825
Contractual Maturity For the Year, 2012171,866113,815
Contractual Maturity For the Year, 201394,25413,902
Contractual Maturity For the Year, 20143,100 
Contractual Maturity, Total Book Value298,691313,542
Contractual Maturity, Unrealized Gain (Loss)69662
Contractual Maturity, Aggregate Fair Value298,760314,204
Certificates Of Deposit [Member]
  
Short-term Debt [Line Items]  
Contractual Maturity For the Year, 20113,91929,844
Contractual Maturity For the Year, 201238,96222,748
Contractual Maturity For the Year, 201317,2403,093
Contractual Maturity For the Year, 20140 
Contractual Maturity, Total Book Value60,12155,685
Contractual Maturity, Unrealized Gain (Loss)158
Contractual Maturity, Aggregate Fair Value60,13655,693
Commercial Paper [Member]
  
Short-term Debt [Line Items]  
Contractual Maturity For the Year, 201114,99427,439
Contractual Maturity For the Year, 201224,7060
Contractual Maturity For the Year, 201300
Contractual Maturity For the Year, 20140 
Contractual Maturity, Total Book Value39,70027,439
Contractual Maturity, Unrealized Gain (Loss)(15)18
Contractual Maturity, Aggregate Fair Value39,68527,457
Corporate Securities [Member]
  
Short-term Debt [Line Items]  
Contractual Maturity For the Year, 201110,55880,062
Contractual Maturity For the Year, 201295,70163,046
Contractual Maturity For the Year, 201341,0988,809
Contractual Maturity For the Year, 20143,100 
Contractual Maturity, Total Book Value150,457151,917
Contractual Maturity, Unrealized Gain (Loss)64598
Contractual Maturity, Aggregate Fair Value150,521152,515
U.S. Government Agency Securities [Member]
  
Short-term Debt [Line Items]  
Contractual Maturity For the Year, 2011048,480
Contractual Maturity For the Year, 201212,49728,021
Contractual Maturity For the Year, 201335,9162,000
Contractual Maturity For the Year, 20140 
Contractual Maturity, Total Book Value48,41378,501
Contractual Maturity, Unrealized Gain (Loss)538
Contractual Maturity, Aggregate Fair Value$ 48,418$ 78,539