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Fair Value Measurements (Details) (USD $)
In Thousands
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2010
Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2010
Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2010
Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2010
Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Jun. 30, 2011
Not Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2011
Not Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Jun. 30, 2011
Not Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Jun. 30, 2011
Not Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Corporate and financial institutions debt [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Corporate and financial institutions debt [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Auction rate securities [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Auction rate securities [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. government agencies [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. government agencies [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. treasury bills [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. treasury bills [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Municipal Bonds [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Municipal Bonds [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Corporate and financial institutions debt [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Corporate and financial institutions debt [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Auction rate securities [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Auction rate securities [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. government agencies [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. government agencies [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. treasury bills [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. treasury bills [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Municipal Bonds [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Municipal Bonds [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Corporate and financial institutions debt [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Corporate and financial institutions debt [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Auction rate securities [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Auction rate securities [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. government agencies [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. government agencies [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. treasury bills [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. treasury bills [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Municipal Bonds [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Municipal Bonds [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Corporate and financial institutions debt [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Corporate and financial institutions debt [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Auction rate securities [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Auction rate securities [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
U.S. government agencies [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
U.S. government agencies [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
U.S. treasury bills [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
U.S. treasury bills [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Municipal Bonds [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Municipal Bonds [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
As reflected on the unaudited balance [Member]
Dec. 31, 2010
Designated as Hedging Instrument [Member]
As reflected on the unaudited balance [Member]
Jun. 30, 2011
Not Designated as Hedging Instrument [Member]
As reflected on the unaudited balance [Member]
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
As reflected on the unaudited balance [Member]
Jun. 30, 2011
As reflected on the unaudited balance [Member]
Dec. 31, 2010
As reflected on the unaudited balance [Member]
Jun. 30, 2011
As reflected on the unaudited balance [Member]
Corporate and financial institutions debt [Member]
Dec. 31, 2010
As reflected on the unaudited balance [Member]
Corporate and financial institutions debt [Member]
Jun. 30, 2011
As reflected on the unaudited balance [Member]
Auction rate securities [Member]
Dec. 31, 2010
As reflected on the unaudited balance [Member]
Auction rate securities [Member]
Jun. 30, 2011
As reflected on the unaudited balance [Member]
U.S. government agencies [Member]
Dec. 31, 2010
As reflected on the unaudited balance [Member]
U.S. government agencies [Member]
Jun. 30, 2011
As reflected on the unaudited balance [Member]
U.S. treasury bills [Member]
Dec. 31, 2010
As reflected on the unaudited balance [Member]
U.S. treasury bills [Member]
Jun. 30, 2011
As reflected on the unaudited balance [Member]
Municipal Bonds [Member]
Dec. 31, 2010
As reflected on the unaudited balance [Member]
Municipal Bonds [Member]
Assets:                                                                                                                                                                    
Money market funds                                     $ 6,715 $ 20,932 $ 6,715 $ 20,932                     $ 0 $ 0                     $ 0 $ 0                                                 $ 6,715 $ 20,932                    
Investments, Fair Value Disclosure                                             0 0 0 0 0 0 57,976 78,916 0 0     205,589 197,813 0 2,725 100,533 99,294 0 0 40,545 37,160     0 0 28,053 28,555 0 0 0 0 0 0 205,589 197,813 28,053 31,280 100,533 99,294 57,976 78,916 40,545 37,160             205,589 197,813 28,053 31,280 100,533 99,294 57,976 78,916 40,545 37,160
Foreign currency option contracts     2 89 0 0 2 89 0 0 110 188 0 0 110 188 0 0                                                                                                 2 89 110 188                        
Total 28,053 31,633                                 439,523 465,672 64,691 99,848                     346,779 337,269                     28,053 28,555                                                 439,523 465,672                    
Liabilities:                                                                                                                                                                    
Liability for contingent consideration                                     270,708 253,548 0 0                     0 0                     270,708 253,548                                                 270,708 253,548                    
Convertible senior notes due 2016 (face value $230,000)                                     271,400 271,768 0 0                     271,400 271,768                     0 0                                                 157,645 152,701                    
Total                                     $ 542,108 $ 525,316 $ 0 $ 0                     $ 271,400 $ 271,768                     $ 270,708 $ 253,548                                                 $ 428,353 $ 406,249