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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Subsidiaries
U.S.
Dec. 31, 2012
Subsidiaries
China
Cash and Cash Equivalents            
Cash and cash equivalents (as a percent)         48.00% 27.00%
Cash and cash equivalents $ 179,584,000 $ 301,626,000 $ 351,507,000 $ 265,843,000 $ 85,300,000 $ 49,300,000
Restricted Cash:            
Short-term restricted cash 13,806,000 12,905,000        
Long-term restricted cash $ 5,800,000 $ 5,700,000