v2.4.0.6
Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents $ 1,815,538 $ 787,829
Short-term investments 299,972 374,862
Restricted cash and investments 2,576 2,876
Long-term investments 6,319 6,319
Derivative assets   10,381
Total assets measured at fair value 2,124,405 1,182,267
Derivative liabilities 21,015 18,690
Total liabilities measured at fair value 21,015 18,690
Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents 1,815,538 787,829
Short-term investments 299,972 374,862
Restricted cash and investments 2,576 2,876
Long-term investments 0 0
Derivative assets   0
Total assets measured at fair value 2,118,086 1,165,567
Derivative liabilities 0 0
Total liabilities measured at fair value 0 0
Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents 0 0
Short-term investments 0 0
Restricted cash and investments 0 0
Long-term investments 0 0
Derivative assets   10,381
Total assets measured at fair value 0 10,381
Derivative liabilities 21,015 18,690
Total liabilities measured at fair value 21,015 18,690
Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents 0 0
Short-term investments 0 0
Restricted cash and investments 0 0
Long-term investments 6,319 6,319
Derivative assets   0
Total assets measured at fair value 6,319 6,319
Derivative liabilities 0 0
Total liabilities measured at fair value $ 0 $ 0