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Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Assets    
Cash equivalents - Money market funds $ 529,194 $ 484,102
Available-for-sale securities 3,287 3,037
Trading securities held in Non - Qualified Deferred Compensation Plan, or NQDC 21,986 24,058
2015 Notes Hedges 257,775 215,113
Foreign currency exchange contracts 170 200
Total Assets 812,412 726,510
Liabilities    
Acquisition-related contingent consideration 3,987 3,911
2015 Notes Embedded Conversion Derivative 257,775 215,113
Total Liabilities 261,762 219,024
Fair Value Measurements, Level 1 [Member]
   
Assets    
Cash equivalents - Money market funds 529,194 484,102
Available-for-sale securities 3,287 3,037
Trading securities held in Non - Qualified Deferred Compensation Plan, or NQDC 21,986 24,058
Total Assets 554,467 511,197
Fair Value Measurements, Level 2 [Member]
   
Assets    
2015 Notes Hedges 257,775 215,113
Foreign currency exchange contracts 170 200
Total Assets 257,945 215,313
Liabilities    
2015 Notes Embedded Conversion Derivative 257,775 215,113
Total Liabilities 257,775 215,113
Fair Value Measurements, Level 3 [Member]
   
Liabilities    
Acquisition-related contingent consideration 3,987 3,911
Total Liabilities $ 3,987 $ 3,911