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Income Tax Provision (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Income Tax Provision [Abstract]          
Income tax expense $ 856,000 $ 4,718,000 $ 1,474,000 $ 9,553,000  
Effective tax rate     10.00% 20.00% 16.00%
Domestic pre-tax income     (14,000,000) (12,000,000)  
Foreign pre-tax income     29,000,000 61,000,000  
Tax holidays     4,000,000 2,000,000  
Tax holidays basic EPS     $ 0.08 $ 0.10  
Tax holidays diluted EPS     $ 0.08 $ 0.10  
Unrecognized tax benefits $ 11,000,000   $ 11,000,000