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FAIR VALUE MEASUREMENTS (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
ASSETS:  
Short-term investments$ 1,983,467$ 1,303,251
LIABILITIES:  
Redeemable noncontrolling interests76,61545,751
Foreign government securities | Recurring Basis | Level 2
  
ASSETS:  
Short-term investments1,143,079683,318
Foreign government securities | Recurring Basis | Total
  
ASSETS:  
Short-term investments1,143,079683,318
U.S. government securities | Recurring Basis | Level 2
  
ASSETS:  
Short-term investments757,304469,208
U.S. government securities | Recurring Basis | Total
  
ASSETS:  
Short-term investments757,304469,208
U.S. agency securities | Recurring Basis | Level 2
  
ASSETS:  
Short-term investments52,545109,905
U.S. agency securities | Recurring Basis | Total
  
ASSETS:  
Short-term investments52,545109,905
U.S. Corporate Notes | Recurring Basis | Level 2
  
ASSETS:  
Short-term investments30,53940,820
U.S. Corporate Notes | Recurring Basis | Total
  
ASSETS:  
Short-term investments30,53940,820
Recurring Basis | Level 2
  
ASSETS:  
Long-term investments 394
Foreign exchange derivative45,8494,970
Total assets at fair value2,029,3161,308,615
LIABILITIES:  
Foreign exchange derivatives1,6696,995
Total liabilities at fair value1,6696,995
Recurring Basis | Level 3
  
LIABILITIES:  
Redeemable noncontrolling interests76,61545,751
Total liabilities at fair value76,61545,751
Recurring Basis | Total
  
ASSETS:  
Long-term investments 394
Foreign exchange derivative45,8494,970
Total assets at fair value2,029,3161,308,615
LIABILITIES:  
Foreign exchange derivatives1,6696,995
Redeemable noncontrolling interests76,61545,751
Total liabilities at fair value78,28452,746
Foreign government securities
  
ASSETS:  
Short-term investments1,143,079683,318
U.S. government securities
  
ASSETS:  
Short-term investments757,304469,208
U.S. agency securities
  
ASSETS:  
Short-term investments52,545109,905
U.S. Corporate Notes
  
ASSETS:  
Short-term investments$ 30,539$ 40,820