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Income Tax Provision (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Income Tax Provision [Abstract]          
Income tax expense $ 509,000 $ 359,000 $ 1,983,000 $ 9,912,000  
Effective tax rate     8.00% 17.00% 16.00%
Domestic pre-tax income     (20,000,000) (20,000,000)  
Foreign pre-tax income     44,000,000 80,000,000  
Tax holidays     5,000,000 6,000,000  
Tax holidays basic EPS     $ 0.11 $ 0.13  
Tax holidays diluted EPS     $ 0.11 $ 0.13  
Unrecognized tax benefits $ 12,000,000   $ 12,000,000