FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
ASSETS:
Short-term investments	$ 1,338,169	$ 1,303,251
LIABILITIES:
Redeemable noncontrolling interests	67,496	45,751
U.S. government securities | Recurring Basis | Level 2
ASSETS:
Short-term investments	586,836	469,208
U.S. government securities | Recurring Basis | Total
ASSETS:
Short-term investments	586,836	469,208
Foreign government securities | Recurring Basis | Level 2
ASSETS:
Short-term investments	664,988	683,318
Foreign government securities | Recurring Basis | Total
ASSETS:
Short-term investments	664,988	683,318
U.S. agency securities | Recurring Basis | Level 2
ASSETS:
Short-term investments	45,587	109,905
U.S. agency securities | Recurring Basis | Total
ASSETS:
Short-term investments	45,587	109,905
Corporate Notes | Recurring Basis | Level 2
ASSETS:
Short-term investments	40,758	40,820
Corporate Notes | Recurring Basis | Total
ASSETS:
Short-term investments	40,758	40,820
Recurring Basis | Level 2
ASSETS:
Long-term investments		394
Foreign exchange derivative	463	4,970
Total assets at fair value	1,338,632	1,308,615
LIABILITIES:
Foreign exchange derivatives	16,468	6,995
Total liabilities at fair value	16,468	6,995
Recurring Basis | Level 3
LIABILITIES:
Redeemable noncontrolling interests	67,496	45,751
Total liabilities at fair value	67,496	45,751
Recurring Basis | Total
ASSETS:
Long-term investments		394
Foreign exchange derivative	463	4,970
Total assets at fair value	1,338,632	1,308,615
LIABILITIES:
Foreign exchange derivatives	16,468	6,995
Redeemable noncontrolling interests	67,496	45,751
Total liabilities at fair value	83,964	52,746
U.S. government securities
ASSETS:
Short-term investments	586,836	469,208
Foreign government securities
ASSETS:
Short-term investments	664,988	683,318
U.S. agency securities
ASSETS:
Short-term investments	45,587	109,905
Corporate Notes
ASSETS:
Short-term investments	40,758	40,820
Long-term investments		$ 400